78718225 has 12 divisors (see below), whose sum is σ = 97727500. Its totient is φ = 62899200.

The previous prime is 78718219. The next prime is 78718253. The reversal of 78718225 is 52281787.

It can be written as a sum of positive squares in 6 ways, for example, as 22648081 + 56070144 = 4759^2 + 7488^2 .

It is not a de Polignac number, because 78718225 - 2³ = 78718217 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29965 + ... + 32485.

Almost surely, 2^78718225 is an apocalyptic number.

It is an amenable number.

78718225 is a deficient number, since it is larger than the sum of its proper divisors (19009275).

78718225 is a wasteful number, since it uses less digits than its factorization.

78718225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3780 (or 3775 counting only the distinct ones).

The product of its digits is 62720, while the sum is 40.

The square root of 78718225 is about 8872.3291755886. The cubic root of 78718225 is about 428.5732866322.

The spelling of 78718225 in words is "seventy-eight million, seven hundred eighteen thousand, two hundred twenty-five".