72310638 has 16 divisors (see below), whose sum is σ = 145035216. Its totient is φ = 24034560.

The previous prime is 72310633. The next prime is 72310657. The reversal of 72310638 is 83601327.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72310633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14953 + ... + 19188.

It is an arithmetic number, because the mean of its divisors is an integer number (9064701).

Almost surely, 2^72310638 is an apocalyptic number.

72310638 is an abundant number, since it is smaller than the sum of its proper divisors (72724578).

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

72310638 is a wasteful number, since it uses less digits than its factorization.

72310638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34499.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 72310638 is about 8503.5661930745. The cubic root of 72310638 is about 416.6141961305.

The spelling of 72310638 in words is "seventy-two million, three hundred ten thousand, six hundred thirty-eight".