78904225 has 36 divisors (see below), whose sum is σ = 106133584. Its totient is φ = 58164480.

The previous prime is 78904223. The next prime is 78904229. The reversal of 78904225 is 52240987.

It is not a de Polignac number, because 78904225 - 2¹ = 78904223 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78904223) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 483994 + ... + 484156.

Almost surely, 2^78904225 is an apocalyptic number.

It is an amenable number.

78904225 is a deficient number, since it is larger than the sum of its proper divisors (27229359).

78904225 is a wasteful number, since it uses less digits than its factorization.

78904225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274 (or 252 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 78904225 is about 8882.8050186864. The cubic root of 78904225 is about 428.9105737463.

The spelling of 78904225 in words is "seventy-eight million, nine hundred four thousand, two hundred twenty-five".