78689625 has 64 divisors (see below), whose sum is σ = 154632192. Its totient is φ = 34776000.

The previous prime is 78689603. The next prime is 78689627. The reversal of 78689625 is 52698687.

It is not a de Polignac number, because 78689625 - 2¹³ = 78681433 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (78689627) 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 63 ways as a sum of consecutive naturals, for example, 80892 + ... + 81858.

It is an arithmetic number, because the mean of its divisors is an integer number (2416128).

Almost surely, 2^78689625 is an apocalyptic number.

78689625 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78689625 is a deficient number, since it is larger than the sum of its proper divisors (75942567).

78689625 is a wasteful number, since it uses less digits than its factorization.

78689625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1023 (or 1013 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 51.

The square root of 78689625 is about 8870.7172765228. The cubic root of 78689625 is about 428.5213770914.

The spelling of 78689625 in words is "seventy-eight million, six hundred eighty-nine thousand, six hundred twenty-five".