977997790 has 128 divisors (see below), whose sum is σ = 2258731008. Its totient is φ = 296110080.

The previous prime is 977997763. The next prime is 977997803. The reversal of 977997790 is 97799779.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7138602 + ... + 7138738.

It is an arithmetic number, because the mean of its divisors is an integer number (17646336).

Almost surely, 2^977997790 is an apocalyptic number.

977997790 is an abundant number, since it is smaller than the sum of its proper divisors (1280733218).

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

977997790 is a wasteful number, since it uses less digits than its factorization.

977997790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362.

The product of its (nonzero) digits is 15752961, while the sum is 64.

The square root of 977997790 is about 31272.9562082001. The cubic root of 977997790 is about 992.6114741328.

The spelling of 977997790 in words is "nine hundred seventy-seven million, nine hundred ninety-seven thousand, seven hundred ninety".