72918638 has 32 divisors (see below), whose sum is σ = 121870560. Its totient is φ = 32503680.

The previous prime is 72918613. The next prime is 72918641. The reversal of 72918638 is 83681927.

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 15 ways as a sum of consecutive naturals, for example, 220133 + ... + 220463.

It is an arithmetic number, because the mean of its divisors is an integer number (3808455).

Almost surely, 2^72918638 is an apocalyptic number.

72918638 is a deficient number, since it is larger than the sum of its proper divisors (48951922).

72918638 is a wasteful number, since it uses less digits than its factorization.

72918638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612.

The product of its digits is 145152, while the sum is 44.

The square root of 72918638 is about 8539.2410669801. The cubic root of 72918638 is about 417.7785927870.

The spelling of 72918638 in words is "seventy-two million, nine hundred eighteen thousand, six hundred thirty-eight".