77989942 has 8 divisors (see below), whose sum is σ = 117639000. Its totient is φ = 38776944.

The previous prime is 77989939. The next prime is 77989963. The reversal of 77989942 is 24998977.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108567 + ... + 109282.

It is an arithmetic number, because the mean of its divisors is an integer number (14704875).

Almost surely, 2^77989942 is an apocalyptic number.

77989942 is a deficient number, since it is larger than the sum of its proper divisors (39649058).

77989942 is a wasteful number, since it uses less digits than its factorization.

77989942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218030.

The product of its digits is 2286144, while the sum is 55.

The square root of 77989942 is about 8831.1914258496. The cubic root of 77989942 is about 427.2475022517.

The spelling of 77989942 in words is "seventy-seven million, nine hundred eighty-nine thousand, nine hundred forty-two".