72505555 has 16 divisors (see below), whose sum is σ = 88833024. Its totient is φ = 56798560.

The previous prime is 72505553. The next prime is 72505567. The reversal of 72505555 is 55550527.

It is not a de Polignac number, because 72505555 - 2¹ = 72505553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72505555.

It is not an unprimeable number, because it can be changed into a prime (72505553) 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, 58674 + ... + 59896.

It is an arithmetic number, because the mean of its divisors is an integer number (5552064).

Almost surely, 2^72505555 is an apocalyptic number.

72505555 is a deficient number, since it is larger than the sum of its proper divisors (16327469).

72505555 is a wasteful number, since it uses less digits than its factorization.

72505555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1466.

The product of its (nonzero) digits is 43750, while the sum is 34.

The square root of 72505555 is about 8515.0193775469. The cubic root of 72505555 is about 416.9881952005.

The spelling of 72505555 in words is "seventy-two million, five hundred five thousand, five hundred fifty-five".