77942990 has 16 divisors (see below), whose sum is σ = 144823680. Its totient is φ = 30171360.

The previous prime is 77942989. The next prime is 77943001. The reversal of 77942990 is 9924977.

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, 125405 + ... + 126024.

It is an arithmetic number, because the mean of its divisors is an integer number (9051480).

Almost surely, 2^77942990 is an apocalyptic number.

77942990 is a deficient number, since it is larger than the sum of its proper divisors (66880690).

77942990 is a wasteful number, since it uses less digits than its factorization.

77942990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251467.

The product of its (nonzero) digits is 285768, while the sum is 47.

The square root of 77942990 is about 8828.5327206734. The cubic root of 77942990 is about 427.1617469559.

The spelling of 77942990 in words is "seventy-seven million, nine hundred forty-two thousand, nine hundred ninety".