77699942 has 4 divisors (see below), whose sum is σ = 116549916. Its totient is φ = 38849970.

The previous prime is 77699917. The next prime is 77699983. The reversal of 77699942 is 24999677.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24999677 = 179 ⋅139663.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19424984 + ... + 19424987.

It is an arithmetic number, because the mean of its divisors is an integer number (29137479).

Almost surely, 2^77699942 is an apocalyptic number.

77699942 is a deficient number, since it is larger than the sum of its proper divisors (38849974).

77699942 is a wasteful number, since it uses less digits than its factorization.

77699942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38849973.

The product of its digits is 1714608, while the sum is 53.

The square root of 77699942 is about 8814.7570584787. The cubic root of 77699942 is about 426.7172814574.

The spelling of 77699942 in words is "seventy-seven million, six hundred ninety-nine thousand, nine hundred forty-two".