78783125 has 20 divisors (see below), whose sum is σ = 99052668. Its totient is φ = 62640000.

The previous prime is 78783097. The next prime is 78783149. The reversal of 78783125 is 52138787.

It can be written as a sum of positive squares in 10 ways, for example, as 72301009 + 6482116 = 8503^2 + 2546^2 .

It is not a de Polignac number, because 78783125 - 2¹⁰ = 78782101 is a prime.

It is a Duffinian number.

It is a congruent 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 19 ways as a sum of consecutive naturals, for example, 145355 + ... + 145895.

Almost surely, 2^78783125 is an apocalyptic number.

It is an amenable number.

78783125 is a deficient number, since it is larger than the sum of its proper divisors (20269543).

78783125 is an equidigital number, since it uses as much as digits as its factorization.

78783125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794 (or 779 counting only the distinct ones).

The product of its digits is 94080, while the sum is 41.

The square root of 78783125 is about 8875.9858607368. The cubic root of 78783125 is about 428.6910347388.

The spelling of 78783125 in words is "seventy-eight million, seven hundred eighty-three thousand, one hundred twenty-five".