77980725 has 60 divisors (see below), whose sum is σ = 146304004. Its totient is φ = 41057280.

The previous prime is 77980723. The next prime is 77980733. The reversal of 77980725 is 52708977.

It can be written as a sum of positive squares in 6 ways, for example, as 505521 + 77475204 = 711^2 + 8802^2 .

It is not a de Polignac number, because 77980725 - 2¹ = 77980723 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77980723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 196227 + ... + 196623.

Almost surely, 2^77980725 is an apocalyptic number.

77980725 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

77980725 is a deficient number, since it is larger than the sum of its proper divisors (68323279).

77980725 is a wasteful number, since it uses less digits than its factorization.

77980725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516 (or 502 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 45.

The square root of 77980725 is about 8830.6695669128. The cubic root of 77980725 is about 427.2306706139.

The spelling of 77980725 in words is "seventy-seven million, nine hundred eighty thousand, seven hundred twenty-five".