77979465 has 24 divisors (see below), whose sum is σ = 135574920. Its totient is φ = 41462784.

The previous prime is 77979449. The next prime is 77979487. The reversal of 77979465 is 56497977.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 26656569 + 51322896 = 5163^2 + 7164^2 .

It is not a de Polignac number, because 77979465 - 2⁴ = 77979449 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13431 + ... + 18339.

It is an arithmetic number, because the mean of its divisors is an integer number (5648955).

Almost surely, 2^77979465 is an apocalyptic number.

It is an amenable number.

77979465 is a deficient number, since it is larger than the sum of its proper divisors (57595455).

77979465 is a wasteful number, since it uses less digits than its factorization.

77979465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5273 (or 5270 counting only the distinct ones).

The product of its digits is 3333960, while the sum is 54.

The square root of 77979465 is about 8830.5982243560. The cubic root of 77979465 is about 427.2283695600.

The spelling of 77979465 in words is "seventy-seven million, nine hundred seventy-nine thousand, four hundred sixty-five".