72639368 has 16 divisors (see below), whose sum is σ = 144210780. Its totient is φ = 34183168.

The previous prime is 72639367. The next prime is 72639373. The reversal of 72639368 is 86393627.

It can be written as a sum of positive squares in 2 ways, for example, as 72624484 + 14884 = 8522^2 + 122^2 .

It is not an unprimeable number, because it can be changed into a prime (72639361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266921 + ... + 267192.

Almost surely, 2^72639368 is an apocalyptic number.

It is an amenable number.

72639368 is a deficient number, since it is larger than the sum of its proper divisors (71571412).

72639368 is a wasteful number, since it uses less digits than its factorization.

72639368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534136 (or 534132 counting only the distinct ones).

The product of its digits is 326592, while the sum is 44.

The square root of 72639368 is about 8522.8732244473. The cubic root of 72639368 is about 417.2445624547.

The spelling of 72639368 in words is "seventy-two million, six hundred thirty-nine thousand, three hundred sixty-eight".