77925977 has 6 divisors (see below), whose sum is σ = 82548414. Its totient is φ = 73307840.

The previous prime is 77925941. The next prime is 77925983. The reversal of 77925977 is 77952977.

It can be written as a sum of positive squares in 3 ways, for example, as 62473216 + 15452761 = 7904^2 + 3931^2 .

It is not a de Polignac number, because 77925977 - 2¹² = 77921881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77925907) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35327 + ... + 37467.

It is an arithmetic number, because the mean of its divisors is an integer number (13758069).

Almost surely, 2^77925977 is an apocalyptic number.

It is an amenable number.

77925977 is a deficient number, since it is larger than the sum of its proper divisors (4622437).

77925977 is an frugal number, since it uses more digits than its factorization.

77925977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4299 (or 2158 counting only the distinct ones).

The product of its digits is 1944810, while the sum is 53.

The square root of 77925977 is about 8827.5691444474. The cubic root of 77925977 is about 427.1306651287.

Subtracting 77925977 from its reverse (77952977), we obtain a cube (27000 = 30³).

The spelling of 77925977 in words is "seventy-seven million, nine hundred twenty-five thousand, nine hundred seventy-seven".