725821761 has 12 divisors (see below), whose sum is σ = 1125764592. Its totient is φ = 414755208.

The previous prime is 725821727. The next prime is 725821769. The reversal of 725821761 is 167128527.

It is not a de Polignac number, because 725821761 - 2⁷ = 725821633 is a prime.

It is a super-2 number, since 2×725821761² = 1053634457482282242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (725821769) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2468635 + ... + 2468928.

It is an arithmetic number, because the mean of its divisors is an integer number (93813716).

Almost surely, 2^725821761 is an apocalyptic number.

It is an amenable number.

725821761 is a deficient number, since it is larger than the sum of its proper divisors (399942831).

725821761 is a wasteful number, since it uses less digits than its factorization.

725821761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4937580 (or 4937573 counting only the distinct ones).

The product of its digits is 47040, while the sum is 39.

The square root of 725821761 is about 26941.0794327176. The cubic root of 725821761 is about 898.6901773794.

The spelling of 725821761 in words is "seven hundred twenty-five million, eight hundred twenty-one thousand, seven hundred sixty-one".