78613825 has 12 divisors (see below), whose sum is σ = 98106940. Its totient is φ = 62487360.

The previous prime is 78613817. The next prime is 78613837. The reversal of 78613825 is 52831687.

It can be written as a sum of positive squares in 6 ways, for example, as 10452289 + 68161536 = 3233^2 + 8256^2 .

It is not a de Polignac number, because 78613825 - 2³ = 78613817 is a prime.

It is a super-2 number, since 2×78613825² = 12360266962261250, which contains 22 as substring.

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 11 ways as a sum of consecutive naturals, for example, 6090 + ... + 13939.

Almost surely, 2^78613825 is an apocalyptic number.

It is an amenable number.

78613825 is a deficient number, since it is larger than the sum of its proper divisors (19493115).

78613825 is a wasteful number, since it uses less digits than its factorization.

78613825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20196 (or 20191 counting only the distinct ones).

The product of its digits is 80640, while the sum is 40.

The square root of 78613825 is about 8866.4437628623. The cubic root of 78613825 is about 428.3837377873.

The spelling of 78613825 in words is "seventy-eight million, six hundred thirteen thousand, eight hundred twenty-five".