72931287 has 16 divisors (see below), whose sum is σ = 114242688. Its totient is φ = 40800480.

The previous prime is 72931283. The next prime is 72931303. The reversal of 72931287 is 78213927.

It is not a de Polignac number, because 72931287 - 2² = 72931283 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72931283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84573 + ... + 85430.

It is an arithmetic number, because the mean of its divisors is an integer number (7140168).

Almost surely, 2^72931287 is an apocalyptic number.

72931287 is a deficient number, since it is larger than the sum of its proper divisors (41311401).

72931287 is a wasteful number, since it uses less digits than its factorization.

72931287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170030.

The product of its digits is 42336, while the sum is 39.

The square root of 72931287 is about 8539.9816744534. The cubic root of 72931287 is about 417.8027483665.

The spelling of 72931287 in words is "seventy-two million, nine hundred thirty-one thousand, two hundred eighty-seven".