726131556 has 36 divisors (see below), whose sum is σ = 1865595004. Its totient is φ = 238075200.

The previous prime is 726131543. The next prime is 726131561. The reversal of 726131556 is 655131627.

726131556 is a `hidden beast` number, since 72 + 6 + 1 + 31 + 556 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 421070400 + 305061156 = 20520^2 + 17466^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×726131556² = 1054534073237962272, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 726131556.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 163135 + ... + 167526.

Almost surely, 2^726131556 is an apocalyptic number.

It is an amenable number.

726131556 is an abundant number, since it is smaller than the sum of its proper divisors (1139463448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

726131556 is a wasteful number, since it uses less digits than its factorization.

726131556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330732 (or 330727 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

The square root of 726131556 is about 26946.8283105823. The cubic root of 726131556 is about 898.8180187391.

The spelling of 726131556 in words is "seven hundred twenty-six million, one hundred thirty-one thousand, five hundred fifty-six".