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681508739 = 19223239673
BaseRepresentation
bin101000100111101…
…111111110000011
31202111101020020102
4220213233332003
52343431234424
6151343033015
722613504642
oct5047577603
91674336212
10681508739
1131a76a66a
1217029b76b
13ab266912
1466723359
153ec6d7ae
hex289eff83

681508739 has 16 divisors (see below), whose sum is σ = 724684800. Its totient is φ = 639104256.

The previous prime is 681508691. The next prime is 681508757. The reversal of 681508739 is 937805186.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 681508739 - 224 = 664731523 is a prime.

It is a super-2 number, since 2×6815087392 = 928908322666740242, which contains 22 as substring.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 681508693 and 681508702.

It is not an unprimeable number, because it can be changed into a prime (681508759) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1012307 + ... + 1012979.

It is an arithmetic number, because the mean of its divisors is an integer number (45292800).

Almost surely, 2681508739 is an apocalyptic number.

681508739 is a deficient number, since it is larger than the sum of its proper divisors (43176061).

681508739 is a wasteful number, since it uses less digits than its factorization.

681508739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1154.

The product of its (nonzero) digits is 362880, while the sum is 47.

The square root of 681508739 is about 26105.7223420460. The cubic root of 681508739 is about 880.0158136793.

The spelling of 681508739 in words is "six hundred eighty-one million, five hundred eight thousand, seven hundred thirty-nine".

Divisors: 1 19 223 239 673 4237 4541 12787 53297 150079 160847 1012643 2851501 3056093 35868881 681508739