72553540 has 12 divisors (see below), whose sum is σ = 152362476. Its totient is φ = 29021408.

The previous prime is 72553529. The next prime is 72553543. The reversal of 72553540 is 4535527.

It can be written as a sum of positive squares in 2 ways, for example, as 41550916 + 31002624 = 6446^2 + 5568^2 .

It is not an unprimeable number, because it can be changed into a prime (72553543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1813819 + ... + 1813858.

It is an arithmetic number, because the mean of its divisors is an integer number (12696873).

Almost surely, 2^72553540 is an apocalyptic number.

It is an amenable number.

72553540 is an abundant number, since it is smaller than the sum of its proper divisors (79808936).

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

72553540 is a wasteful number, since it uses less digits than its factorization.

72553540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3627686 (or 3627684 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 31.

The square root of 72553540 is about 8517.8365797895. The cubic root of 72553540 is about 417.0801640897.

The spelling of 72553540 in words is "seventy-two million, five hundred fifty-three thousand, five hundred forty".