77908823990 has 32 divisors (see below), whose sum is σ = 141965351136. Its totient is φ = 30779415040.

The previous prime is 77908823981. The next prime is 77908824013. The reversal of 77908823990 is 9932880977.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3508964 + ... + 3531096.

It is an arithmetic number, because the mean of its divisors is an integer number (4436417223).

Almost surely, 2^77908823990 is an apocalyptic number.

77908823990 is a deficient number, since it is larger than the sum of its proper divisors (64056527146).

77908823990 is a wasteful number, since it uses less digits than its factorization.

77908823990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26464.

The product of its (nonzero) digits is 13716864, while the sum is 62.

The spelling of 77908823990 in words is "seventy-seven billion, nine hundred eight million, eight hundred twenty-three thousand, nine hundred ninety".