78163825 has 6 divisors (see below), whose sum is σ = 96923174. Its totient is φ = 62531040.

The previous prime is 78163819. The next prime is 78163837. The reversal of 78163825 is 52836187.

It can be written as a sum of positive squares in 3 ways, for example, as 26998416 + 51165409 = 5196^2 + 7153^2 .

It is not a de Polignac number, because 78163825 - 2⁹ = 78163313 is a prime.

It is a super-2 number, since 2×78163825² = 12219167077261250, which contains 22 as substring.

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, 1563252 + ... + 1563301.

Almost surely, 2^78163825 is an apocalyptic number.

It is an amenable number.

78163825 is a deficient number, since it is larger than the sum of its proper divisors (18759349).

78163825 is a wasteful number, since it uses less digits than its factorization.

78163825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3126563 (or 3126558 counting only the distinct ones).

The product of its digits is 80640, while the sum is 40.

The square root of 78163825 is about 8841.0307656970. The cubic root of 78163825 is about 427.5647907454.

The spelling of 78163825 in words is "seventy-eight million, one hundred sixty-three thousand, eight hundred twenty-five".