77990265 has 48 divisors (see below), whose sum is σ = 143410176. Its totient is φ = 39139200.

The previous prime is 77990257. The next prime is 77990273. The reversal of 77990265 is 56209977.

It is an interprime number because it is at equal distance from previous prime (77990257) and next prime (77990273).

It is not a de Polignac number, because 77990265 - 2³ = 77990257 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 77990265.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 50860 + ... + 52370.

It is an arithmetic number, because the mean of its divisors is an integer number (2987712).

Almost surely, 2^77990265 is an apocalyptic number.

It is an amenable number.

77990265 is a deficient number, since it is larger than the sum of its proper divisors (65419911).

77990265 is a wasteful number, since it uses less digits than its factorization.

77990265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1590 (or 1587 counting only the distinct ones).

The product of its (nonzero) digits is 238140, while the sum is 45.

The square root of 77990265 is about 8831.2097132839. The cubic root of 77990265 is about 427.2480920746.

The spelling of 77990265 in words is "seventy-seven million, nine hundred ninety thousand, two hundred sixty-five".