78863625 has 40 divisors (see below), whose sum is σ = 147044040. Its totient is φ = 42055200.

The previous prime is 78863621. The next prime is 78863647. The reversal of 78863625 is 52636887.

78863625 is a `hidden beast` number, since 7 + 8 + 8 + 636 + 2 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2178576 + 76685049 = 1476^2 + 8757^2 .

It is not a de Polignac number, because 78863625 - 2² = 78863621 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 (78863621) 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 39 ways as a sum of consecutive naturals, for example, 6231 + ... + 14019.

It is an arithmetic number, because the mean of its divisors is an integer number (3676101).

Almost surely, 2^78863625 is an apocalyptic number.

78863625 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78863625 is a deficient number, since it is larger than the sum of its proper divisors (68180415).

78863625 is an equidigital number, since it uses as much as digits as its factorization.

78863625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7816 (or 7797 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 78863625 is about 8880.5194104850. The cubic root of 78863625 is about 428.8369961193.

It can be divided in two parts, 7886 and 3625, that added together give a palindrome (11511).

The spelling of 78863625 in words is "seventy-eight million, eight hundred sixty-three thousand, six hundred twenty-five".