78825615 has 16 divisors (see below), whose sum is σ = 137586816. Its totient is φ = 38218400.

The previous prime is 78825601. The next prime is 78825629. The reversal of 78825615 is 51652887.

It is an interprime number because it is at equal distance from previous prime (78825601) and next prime (78825629).

It is not a de Polignac number, because 78825615 - 2⁴ = 78825599 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 238701 + ... + 239030.

It is an arithmetic number, because the mean of its divisors is an integer number (8599176).

Almost surely, 2^78825615 is an apocalyptic number.

78825615 is a deficient number, since it is larger than the sum of its proper divisors (58761201).

78825615 is a wasteful number, since it uses less digits than its factorization.

78825615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477750.

The product of its digits is 134400, while the sum is 42.

The square root of 78825615 is about 8878.3790750339. The cubic root of 78825615 is about 428.7680893466.

The spelling of 78825615 in words is "seventy-eight million, eight hundred twenty-five thousand, six hundred fifteen".