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720801 = 322832
BaseRepresentation
bin10101111111110100001
31100121202100
42233332201
5141031201
623241013
76061314
oct2577641
91317670
10720801
11452604
122a9169
131c3113
1414a97b
15e3886
hexaffa1

720801 has 9 divisors (see below), whose sum is σ = 1044849. Its totient is φ = 478836.

The previous prime is 720793. The next prime is 720829. The reversal of 720801 is 108027.

Added to its reverse (108027) it gives a triangular number (828828 = T1287).

The square root of 720801 is 849.

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

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

It is not a de Polignac number, because 720801 - 23 = 720793 is a prime.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 720801.

It is not an unprimeable number, because it can be changed into a prime (720101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2406 + ... + 2688.

2720801 is an apocalyptic number.

720801 is the 849-th square number.

720801 is the 425-th centered octagonal number.

It is an amenable number.

720801 is a deficient number, since it is larger than the sum of its proper divisors (324048).

720801 is an equidigital number, since it uses as much as digits as its factorization.

720801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572 (or 286 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The cubic root of 720801 is about 89.6613196985.

Adding to 720801 its reverse (108027), we get a palindrome (828828).

It can be divided in two parts, 720 and 801, that added together give a square (1521 = 392).

The spelling of 720801 in words is "seven hundred twenty thousand, eight hundred one".

Divisors: 1 3 9 283 849 2547 80089 240267 720801