72555651 has 48 divisors (see below), whose sum is σ = 125199360. Its totient is φ = 39614400.

The previous prime is 72555647. The next prime is 72555653. The reversal of 72555651 is 15655527.

It is a happy number.

It is not a de Polignac number, because 72555651 - 2² = 72555647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72555653) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 275746 + ... + 276008.

It is an arithmetic number, because the mean of its divisors is an integer number (2608320).

Almost surely, 2^72555651 is an apocalyptic number.

72555651 is a deficient number, since it is larger than the sum of its proper divisors (52643709).

72555651 is a wasteful number, since it uses less digits than its factorization.

72555651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456 (or 453 counting only the distinct ones).

The product of its digits is 52500, while the sum is 36.

The square root of 72555651 is about 8517.9604953299. The cubic root of 72555651 is about 417.0842091379.

The spelling of 72555651 in words is "seventy-two million, five hundred fifty-five thousand, six hundred fifty-one".