72491287 has 8 divisors (see below), whose sum is σ = 80035200. Its totient is φ = 65106360.

The previous prime is 72491273. The next prime is 72491311. The reversal of 72491287 is 78219427.

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

It is not a de Polignac number, because 72491287 - 2¹¹ = 72489239 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 (72491207) 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, 38787 + ... + 40612.

It is an arithmetic number, because the mean of its divisors is an integer number (10004400).

Almost surely, 2^72491287 is an apocalyptic number.

72491287 is a deficient number, since it is larger than the sum of its proper divisors (7543913).

72491287 is a wasteful number, since it uses less digits than its factorization.

72491287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79493.

The product of its digits is 56448, while the sum is 40.

The square root of 72491287 is about 8514.1815226127. The cubic root of 72491287 is about 416.9608410763.

The spelling of 72491287 in words is "seventy-two million, four hundred ninety-one thousand, two hundred eighty-seven".