78725515 has 8 divisors (see below), whose sum is σ = 103058928. Its totient is φ = 57254880.

The previous prime is 78725509. The next prime is 78725539. The reversal of 78725515 is 51552787.

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

It is not a de Polignac number, because 78725515 - 2²³ = 70336907 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 715632 + ... + 715741.

It is an arithmetic number, because the mean of its divisors is an integer number (12882366).

Almost surely, 2^78725515 is an apocalyptic number.

78725515 is a deficient number, since it is larger than the sum of its proper divisors (24333413).

78725515 is a wasteful number, since it uses less digits than its factorization.

78725515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1431389.

The product of its digits is 98000, while the sum is 40.

The square root of 78725515 is about 8872.7399939365. The cubic root of 78725515 is about 428.5865161091.

The spelling of 78725515 in words is "seventy-eight million, seven hundred twenty-five thousand, five hundred fifteen".