72520555 has 16 divisors (see below), whose sum is σ = 94638240. Its totient is φ = 53125632.

The previous prime is 72520543. The next prime is 72520559. The reversal of 72520555 is 55502527.

It is a cyclic number.

It is not a de Polignac number, because 72520555 - 2¹¹ = 72518507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72520559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8385 + ... + 14674.

It is an arithmetic number, because the mean of its divisors is an integer number (5914890).

Almost surely, 2^72520555 is an apocalyptic number.

72520555 is a deficient number, since it is larger than the sum of its proper divisors (22117685).

72520555 is a wasteful number, since it uses less digits than its factorization.

72520555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23118.

The product of its (nonzero) digits is 17500, while the sum is 31.

The square root of 72520555 is about 8515.9001285830. The cubic root of 72520555 is about 417.0169488210.

The spelling of 72520555 in words is "seventy-two million, five hundred twenty thousand, five hundred fifty-five".