72639271 has 2 divisors, whose sum is σ = 72639272. Its totient is φ = 72639270.

The previous prime is 72639269. The next prime is 72639277. The reversal of 72639271 is 17293627.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72639271 - 2¹ = 72639269 is a prime.

It is a super-2 number, since 2×72639271² = 10552927382822882, which contains 22 as substring.

Together with 72639269, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 72639271.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72639277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36319635 + 36319636.

It is an arithmetic number, because the mean of its divisors is an integer number (36319636).

Almost surely, 2^72639271 is an apocalyptic number.

72639271 is a deficient number, since it is larger than the sum of its proper divisors (1).

72639271 is an equidigital number, since it uses as much as digits as its factorization.

72639271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31752, while the sum is 37.

The square root of 72639271 is about 8522.8675338761. The cubic root of 72639271 is about 417.2443767302.

The spelling of 72639271 in words is "seventy-two million, six hundred thirty-nine thousand, two hundred seventy-one".