72969639 has 8 divisors (see below), whose sum is σ = 101523072. Its totient is φ = 46531320.

The previous prime is 72969623. The next prime is 72969653. The reversal of 72969639 is 93696927.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72969639 - 2⁴ = 72969623 is a prime.

It is a nialpdrome in base 14.

It is a zygodrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 72969591 and 72969600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72961639) 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, 528697 + ... + 528834.

It is an arithmetic number, because the mean of its divisors is an integer number (12690384).

Almost surely, 2^72969639 is an apocalyptic number.

72969639 is a deficient number, since it is larger than the sum of its proper divisors (28553433).

72969639 is a wasteful number, since it uses less digits than its factorization.

72969639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1057557.

The product of its digits is 1102248, while the sum is 51.

The square root of 72969639 is about 8542.2268174054. The cubic root of 72969639 is about 417.8759714588.

The spelling of 72969639 in words is "seventy-two million, nine hundred sixty-nine thousand, six hundred thirty-nine".