72891999 has 24 divisors (see below), whose sum is σ = 111196800. Its totient is φ = 45884880.

The previous prime is 72891997. The next prime is 72892019. The reversal of 72891999 is 99919827.

It is not a de Polignac number, because 72891999 - 2¹ = 72891997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72891997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74584 + ... + 75554.

It is an arithmetic number, because the mean of its divisors is an integer number (4633200).

Almost surely, 2^72891999 is an apocalyptic number.

72891999 is a deficient number, since it is larger than the sum of its proper divisors (38304801).

72891999 is a wasteful number, since it uses less digits than its factorization.

72891999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1435 (or 1432 counting only the distinct ones).

The product of its digits is 734832, while the sum is 54.

The square root of 72891999 is about 8537.6811254579. The cubic root of 72891999 is about 417.7277116050.

The spelling of 72891999 in words is "seventy-two million, eight hundred ninety-one thousand, nine hundred ninety-nine".