78125015 has 16 divisors (see below), whose sum is σ = 96132960. Its totient is φ = 60931200.

The previous prime is 78124999. The next prime is 78125041. The reversal of 78125015 is 51052187.

It is not a de Polignac number, because 78125015 - 2⁴ = 78124999 is a prime.

It is a super-2 number, since 2×78125015² = 12207035937500450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32681 + ... + 34989.

It is an arithmetic number, because the mean of its divisors is an integer number (6008310).

Almost surely, 2^78125015 is an apocalyptic number.

78125015 is a deficient number, since it is larger than the sum of its proper divisors (18007945).

78125015 is a wasteful number, since it uses less digits than its factorization.

78125015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2482.

The product of its (nonzero) digits is 2800, while the sum is 29.

The square root of 78125015 is about 8838.8356133599. The cubic root of 78125015 is about 427.4940140288.

The spelling of 78125015 in words is "seventy-eight million, one hundred twenty-five thousand, fifteen".