725716881 has 16 divisors (see below), whose sum is σ = 1075969920. Its totient is φ = 483436080.

The previous prime is 725716879. The next prime is 725716883. The reversal of 725716881 is 188617527.

It is a happy number.

725716881 is a `hidden beast` number, since 72 + 571 + 6 + 8 + 8 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (725716879) and next prime (725716883).

It is not a de Polignac number, because 725716881 - 2¹ = 725716879 is a prime.

It is a super-2 number, since 2×725716881² = 1053329982736736322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (725716883) 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, 27556 + ... + 47018.

It is an arithmetic number, because the mean of its divisors is an integer number (67248120).

Almost surely, 2^725716881 is an apocalyptic number.

It is an amenable number.

725716881 is a deficient number, since it is larger than the sum of its proper divisors (350253039).

725716881 is a wasteful number, since it uses less digits than its factorization.

725716881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20853 (or 20847 counting only the distinct ones).

The product of its digits is 188160, while the sum is 45.

The square root of 725716881 is about 26939.1328925042. The cubic root of 725716881 is about 898.6468888977.

The spelling of 725716881 in words is "seven hundred twenty-five million, seven hundred sixteen thousand, eight hundred eighty-one".