77970025 has 18 divisors (see below), whose sum is σ = 112469550. Its totient is φ = 53464320.

The previous prime is 77970001. The next prime is 77970031. The reversal of 77970025 is 52007977.

It can be written as a sum of positive squares in 3 ways, for example, as 670761 + 77299264 = 819^2 + 8792^2 .

It is not a de Polignac number, because 77970025 - 2⁷ = 77969897 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 30600 + ... + 33049.

Almost surely, 2^77970025 is an apocalyptic number.

It is an amenable number.

77970025 is a deficient number, since it is larger than the sum of its proper divisors (34499525).

77970025 is a wasteful number, since it uses less digits than its factorization.

77970025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63673 (or 63661 counting only the distinct ones).

The product of its (nonzero) digits is 30870, while the sum is 37.

The square root of 77970025 is about 8830.0637030545. The cubic root of 77970025 is about 427.2111291299.

The spelling of 77970025 in words is "seventy-seven million, nine hundred seventy thousand, twenty-five".