77868390 has 16 divisors (see below), whose sum is σ = 186884208. Its totient is φ = 20764896.

The previous prime is 77868383. The next prime is 77868407. The reversal of 77868390 is 9386877.

It is a super-2 number, since 2×77868390² = 12126972322384200, which contains 22 as substring.

It is a congruent number.

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, 1297777 + ... + 1297836.

It is an arithmetic number, because the mean of its divisors is an integer number (11680263).

Almost surely, 2^77868390 is an apocalyptic number.

77868390 is an abundant number, since it is smaller than the sum of its proper divisors (109015818).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77868390 is a wasteful number, since it uses less digits than its factorization.

77868390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2595623.

The product of its (nonzero) digits is 508032, while the sum is 48.

The square root of 77868390 is about 8824.3067716393. The cubic root of 77868390 is about 427.0254232222.

The spelling of 77868390 in words is "seventy-seven million, eight hundred sixty-eight thousand, three hundred ninety".