72638311 has 4 divisors (see below), whose sum is σ = 76461400. Its totient is φ = 68815224.

The previous prime is 72638299. The next prime is 72638323. The reversal of 72638311 is 11383627.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (72638299) and next prime (72638323).

It is a cyclic number.

It is not a de Polignac number, because 72638311 - 2¹³ = 72630119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72638351) 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, 1911516 + ... + 1911553.

It is an arithmetic number, because the mean of its divisors is an integer number (19115350).

Almost surely, 2^72638311 is an apocalyptic number.

72638311 is a deficient number, since it is larger than the sum of its proper divisors (3823089).

72638311 is a wasteful number, since it uses less digits than its factorization.

72638311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3823088.

The product of its digits is 6048, while the sum is 31.

The square root of 72638311 is about 8522.8112146169. The cubic root of 72638311 is about 417.2425386227.

The spelling of 72638311 in words is "seventy-two million, six hundred thirty-eight thousand, three hundred eleven".