72779715 has 56 divisors (see below), whose sum is σ = 134412768. Its totient is φ = 37791360.

The previous prime is 72779687. The next prime is 72779719. The reversal of 72779715 is 51797727.

It is not a de Polignac number, because 72779715 - 2⁵ = 72779683 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (72779719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 149202 + ... + 149688.

It is an arithmetic number, because the mean of its divisors is an integer number (2400228).

Almost surely, 2^72779715 is an apocalyptic number.

72779715 is a deficient number, since it is larger than the sum of its proper divisors (61633053).

72779715 is an equidigital number, since it uses as much as digits as its factorization.

72779715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551 (or 536 counting only the distinct ones).

The product of its digits is 216090, while the sum is 45.

The square root of 72779715 is about 8531.1028009279. The cubic root of 72779715 is about 417.5131098947.

The spelling of 72779715 in words is "seventy-two million, seven hundred seventy-nine thousand, seven hundred fifteen".