72520656 has 160 divisors (see below), whose sum is σ = 218652672. Its totient is φ = 20528640.

The previous prime is 72520649. The next prime is 72520681. The reversal of 72520656 is 65602527.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 444831 + ... + 444993.

Almost surely, 2^72520656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72520656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109326336).

72520656 is an abundant number, since it is smaller than the sum of its proper divisors (146132016).

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

72520656 is a wasteful number, since it uses less digits than its factorization.

72520656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241 (or 235 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 72520656 is about 8515.9060586646. The cubic root of 72520656 is about 417.0171424153.

The spelling of 72520656 in words is "seventy-two million, five hundred twenty thousand, six hundred fifty-six".