72400540 has 24 divisors (see below), whose sum is σ = 152242272. Its totient is φ = 28921920.

The previous prime is 72400499. The next prime is 72400561. The reversal of 72400540 is 4500427.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 16897 + ... + 20743.

It is an arithmetic number, because the mean of its divisors is an integer number (6343428).

Almost surely, 2^72400540 is an apocalyptic number.

It is an amenable number.

72400540 is an abundant number, since it is smaller than the sum of its proper divisors (79841732).

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

72400540 is a wasteful number, since it uses less digits than its factorization.

72400540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4797 (or 4795 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 22.

The square root of 72400540 is about 8508.8506861973. The cubic root of 72400540 is about 416.7867799492.

Adding to 72400540 its reverse (4500427), we get a palindrome (76900967).

The spelling of 72400540 in words is "seventy-two million, four hundred thousand, five hundred forty".