72868638 has 16 divisors (see below), whose sum is σ = 146581776. Its totient is φ = 24148800.

The previous prime is 72868637. The next prime is 72868643. The reversal of 72868638 is 83686827.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72868633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34063 + ... + 36138.

It is an arithmetic number, because the mean of its divisors is an integer number (9161361).

Almost surely, 2^72868638 is an apocalyptic number.

72868638 is an abundant number, since it is smaller than the sum of its proper divisors (73713138).

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

72868638 is a wasteful number, since it uses less digits than its factorization.

72868638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70379.

The product of its digits is 774144, while the sum is 48.

The square root of 72868638 is about 8536.3129042930. The cubic root of 72868638 is about 417.6830812848.

The spelling of 72868638 in words is "seventy-two million, eight hundred sixty-eight thousand, six hundred thirty-eight".