77704225 has 27 divisors (see below), whose sum is σ = 101110809. Its totient is φ = 59236800.

The previous prime is 77704217. The next prime is 77704241. The reversal of 77704225 is 52240777.

The square root of 77704225 is 8815.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 32706961 + 44997264 = 5719^2 + 6708^2 .

It is not a de Polignac number, because 77704225 - 2³ = 77704217 is a prime.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1807054 + ... + 1807096.

Almost surely, 2^77704225 is an apocalyptic number.

77704225 is the 8815-th square number.

77704225 is the 4408-th centered octagonal number.

It is an amenable number.

77704225 is a deficient number, since it is larger than the sum of its proper divisors (23406584).

77704225 is an equidigital number, since it uses as much as digits as its factorization.

77704225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 27440, while the sum is 34.

The cubic root of 77704225 is about 426.7251218603.

The spelling of 77704225 in words is "seventy-seven million, seven hundred four thousand, two hundred twenty-five".