78538825 has 6 divisors (see below), whose sum is σ = 97388174. Its totient is φ = 62831040.

The previous prime is 78538783. The next prime is 78538843. The reversal of 78538825 is 52883587.

It can be written as a sum of positive squares in 3 ways, for example, as 163216 + 78375609 = 404^2 + 8853^2 .

It is not a de Polignac number, because 78538825 - 2⁷ = 78538697 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1570752 + ... + 1570801.

Almost surely, 2^78538825 is an apocalyptic number.

It is an amenable number.

78538825 is a deficient number, since it is larger than the sum of its proper divisors (18849349).

78538825 is a wasteful number, since it uses less digits than its factorization.

78538825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3141563 (or 3141558 counting only the distinct ones).

The product of its digits is 537600, while the sum is 46.

The square root of 78538825 is about 8862.2133239953. The cubic root of 78538825 is about 428.2474640338.

The spelling of 78538825 in words is "seventy-eight million, five hundred thirty-eight thousand, eight hundred twenty-five".