977665 has 16 divisors (see below), whose sum is σ = 1285200. Its totient is φ = 713856.

The previous prime is 977629. The next prime is 977671. The reversal of 977665 is 566779.

977665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 859329 + 118336 = 927^2 + 344^2 .

It is not a de Polignac number, because 977665 - 2¹⁵ = 944897 is a prime.

It is a nialpdrome in base 10.

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, 10941 + ... + 11029.

It is an arithmetic number, because the mean of its divisors is an integer number (80325).

2⁹⁷⁷⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

977665 is a deficient number, since it is larger than the sum of its proper divisors (307535).

977665 is an equidigital number, since it uses as much as digits as its factorization.

977665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133 (or 107 counting only the distinct ones).

The product of its digits is 79380, while the sum is 40.

The square root of 977665 is about 988.7694372299. The cubic root of 977665 is about 99.2498873794.

The spelling of 977665 in words is "nine hundred seventy-seven thousand, six hundred sixty-five".