977705997 has 16 divisors (see below), whose sum is σ = 1323786240. Its totient is φ = 641740400.

The previous prime is 977705977. The next prime is 977706013. The reversal of 977705997 is 799507779.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 977705997 - 2²⁶ = 910597133 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 977705997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (977705917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175972 + ... + 181442.

It is an arithmetic number, because the mean of its divisors is an integer number (82736640).

Almost surely, 2^977705997 is an apocalyptic number.

It is an amenable number.

977705997 is a deficient number, since it is larger than the sum of its proper divisors (346080243).

977705997 is a wasteful number, since it uses less digits than its factorization.

977705997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6384.

The product of its (nonzero) digits is 8751645, while the sum is 60.

The square root of 977705997 is about 31268.2905992637. The cubic root of 977705997 is about 992.5127466126.

The spelling of 977705997 in words is "nine hundred seventy-seven million, seven hundred five thousand, nine hundred ninety-seven".