77980625 has 10 divisors (see below), whose sum is σ = 97445370. Its totient is φ = 62384000.

The previous prime is 77980601. The next prime is 77980627. The reversal of 77980625 is 52608977.

It can be written as a sum of positive squares in 5 ways, for example, as 25331089 + 52649536 = 5033^2 + 7256^2 .

It is not a de Polignac number, because 77980625 - 2⁸ = 77980369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77980627) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 61760 + ... + 63009.

It is an arithmetic number, because the mean of its divisors is an integer number (9744537).

Almost surely, 2^77980625 is an apocalyptic number.

It is an amenable number.

77980625 is a deficient number, since it is larger than the sum of its proper divisors (19464745).

77980625 is an equidigital number, since it uses as much as digits as its factorization.

77980625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124789 (or 124774 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 77980625 is about 8830.6639048262. The cubic root of 77980625 is about 427.2304879915.

The spelling of 77980625 in words is "seventy-seven million, nine hundred eighty thousand, six hundred twenty-five".