78128125 has 24 divisors (see below), whose sum is σ = 101993472. Its totient is φ = 59730000.

The previous prime is 78128081. The next prime is 78128131. The reversal of 78128125 is 52182187.

It is not a de Polignac number, because 78128125 - 2⁹ = 78127613 is a prime.

It is a super-2 number, since 2×78128125² = 12208007832031250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 71332 + ... + 72418.

It is an arithmetic number, because the mean of its divisors is an integer number (4249728).

Almost surely, 2^78128125 is an apocalyptic number.

It is an amenable number.

78128125 is a deficient number, since it is larger than the sum of its proper divisors (23865347).

78128125 is an equidigital number, since it uses as much as digits as its factorization.

78128125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1135 (or 1115 counting only the distinct ones).

The product of its digits is 8960, while the sum is 34.

The square root of 78128125 is about 8839.0115397594. The cubic root of 78128125 is about 427.4996865130.

The spelling of 78128125 in words is "seventy-eight million, one hundred twenty-eight thousand, one hundred twenty-five".