77139890 has 16 divisors (see below), whose sum is σ = 139309632. Its totient is φ = 30754224.

The previous prime is 77139889. The next prime is 77139917. The reversal of 77139890 is 9893177.

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 in 7 ways as a sum of consecutive naturals, for example, 9494 + ... + 15633.

It is an arithmetic number, because the mean of its divisors is an integer number (8706852).

Almost surely, 2^77139890 is an apocalyptic number.

77139890 is a deficient number, since it is larger than the sum of its proper divisors (62169742).

77139890 is a wasteful number, since it uses less digits than its factorization.

77139890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25441.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 77139890 is about 8782.9317428749. The cubic root of 77139890 is about 425.6895656905.

The spelling of 77139890 in words is "seventy-seven million, one hundred thirty-nine thousand, eight hundred ninety".