72507438 has 12 divisors (see below), whose sum is σ = 157099488. Its totient is φ = 24169140.

The previous prime is 72507433. The next prime is 72507493. The reversal of 72507438 is 83470527.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72507433) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2014078 + ... + 2014113.

It is an arithmetic number, because the mean of its divisors is an integer number (13091624).

Almost surely, 2^72507438 is an apocalyptic number.

72507438 is an abundant number, since it is smaller than the sum of its proper divisors (84592050).

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

72507438 is a wasteful number, since it uses less digits than its factorization.

72507438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4028199 (or 4028196 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

The square root of 72507438 is about 8515.1299461605. The cubic root of 72507438 is about 416.9918049560.

The spelling of 72507438 in words is "seventy-two million, five hundred seven thousand, four hundred thirty-eight".