77905090 has 16 divisors (see below), whose sum is σ = 140755320. Its totient is φ = 31045120.

The previous prime is 77905063. The next prime is 77905103. The reversal of 77905090 is 9050977.

It can be written as a sum of positive squares in 4 ways, for example, as 63059481 + 14845609 = 7941^2 + 3853^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11791 + ... + 17170.

Almost surely, 2^77905090 is an apocalyptic number.

77905090 is a deficient number, since it is larger than the sum of its proper divisors (62850230).

77905090 is a wasteful number, since it uses less digits than its factorization.

77905090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29237.

The product of its (nonzero) digits is 19845, while the sum is 37.

The square root of 77905090 is about 8826.3860101403. The cubic root of 77905090 is about 427.0924995270.

It can be divided in two parts, 7790 and 5090, that added together give a triangular number (12880 = T₁₆₀).

The spelling of 77905090 in words is "seventy-seven million, nine hundred five thousand, ninety".