77331990 has 16 divisors (see below), whose sum is σ = 185596848. Its totient is φ = 20621856.

The previous prime is 77331983. The next prime is 77332007. The reversal of 77331990 is 9913377.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1288837 + ... + 1288896.

It is an arithmetic number, because the mean of its divisors is an integer number (11599803).

Almost surely, 2^77331990 is an apocalyptic number.

77331990 is an abundant number, since it is smaller than the sum of its proper divisors (108264858).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77331990 is a wasteful number, since it uses less digits than its factorization.

77331990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2577743.

The product of its (nonzero) digits is 35721, while the sum is 39.

The square root of 77331990 is about 8793.8609268057. The cubic root of 77331990 is about 426.0426349799.

The spelling of 77331990 in words is "seventy-seven million, three hundred thirty-one thousand, nine hundred ninety".