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70408881 = 3227972
BaseRepresentation
bin1000011001001…
…01101010110001
311220111010211100
410030211222301
5121011041011
610553035013
71513315464
oct414455261
9156433740
1070408881
1136820264
121b6b5a69
131178297a
1494cb2db
1562abd56
hex4325ab1

70408881 has 9 divisors (see below), whose sum is σ = 101738091. Its totient is φ = 46922472.

The previous prime is 70408859. The next prime is 70408901. The reversal of 70408881 is 18880407.

The square root of 70408881 is 8391.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 52056225 + 18352656 = 7215^2 + 4284^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 70408881 - 219 = 69884593 is a prime.

It is a super-2 number, since 2×704088812 = 9914821047344322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (70408841) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 23775 + ... + 26571.

Almost surely, 270408881 is an apocalyptic number.

70408881 is the 8391-st square number.

70408881 is the 4196-th centered octagonal number.

It is an amenable number.

70408881 is a deficient number, since it is larger than the sum of its proper divisors (31329210).

70408881 is an frugal number, since it uses more digits than its factorization.

70408881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5600 (or 2800 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The cubic root of 70408881 is about 412.9294084822.

Multiplying 70408881 by its sum of digits (36), we get a square (2534719716 = 503462).

It can be divided in two parts, 70408 and 881, that added together give a square (71289 = 2672).

The spelling of 70408881 in words is "seventy million, four hundred eight thousand, eight hundred eighty-one".

Divisors: 1 3 9 2797 8391 25173 7823209 23469627 70408881