72639369 has 32 divisors (see below), whose sum is σ = 118356480. Its totient is φ = 43664400.

The previous prime is 72639367. The next prime is 72639373. The reversal of 72639369 is 96393627.

72639369 is a `hidden beast` number, since 7 + 2 + 639 + 3 + 6 + 9 = 666.

It is not a de Polignac number, because 72639369 - 2¹ = 72639367 is a prime.

It is a super-2 number, since 2×72639369² = 10552955857436322, which contains 22 as substring.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37974 + ... + 39840.

It is an arithmetic number, because the mean of its divisors is an integer number (3698640).

Almost surely, 2^72639369 is an apocalyptic number.

It is an amenable number.

72639369 is a deficient number, since it is larger than the sum of its proper divisors (45717111).

72639369 is a wasteful number, since it uses less digits than its factorization.

72639369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2018 (or 2012 counting only the distinct ones).

The product of its digits is 367416, while the sum is 45.

The square root of 72639369 is about 8522.8732831129. The cubic root of 72639369 is about 417.2445643694.

The spelling of 72639369 in words is "seventy-two million, six hundred thirty-nine thousand, three hundred sixty-nine".