77139922 has 4 divisors (see below), whose sum is σ = 115709886. Its totient is φ = 38569960.

The previous prime is 77139919. The next prime is 77139961. The reversal of 77139922 is 22993177.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 66243321 + 10896601 = 8139^2 + 3301^2 .

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, 19284979 + ... + 19284982.

Almost surely, 2^77139922 is an apocalyptic number.

77139922 is a deficient number, since it is larger than the sum of its proper divisors (38569964).

77139922 is a wasteful number, since it uses less digits than its factorization.

77139922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38569963.

The product of its digits is 47628, while the sum is 40.

The square root of 77139922 is about 8782.9335645899. The cubic root of 77139922 is about 425.6896245535.

The spelling of 77139922 in words is "seventy-seven million, one hundred thirty-nine thousand, nine hundred twenty-two".