977864681 has 8 divisors (see below), whose sum is σ = 1002083400. Its totient is φ = 953859712.

The previous prime is 977864669. The next prime is 977864683. The reversal of 977864681 is 186468779.

977864681 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 4 ways, for example, as 728730025 + 249134656 = 26995^2 + 15784^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 977864681 - 2⁶ = 977864617 is a prime.

It is a super-2 number, since 2×977864681² = 1912438668694463522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (977864683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44156 + ... + 62493.

It is an arithmetic number, because the mean of its divisors is an integer number (125260425).

Almost surely, 2^977864681 is an apocalyptic number.

It is an amenable number.

977864681 is a deficient number, since it is larger than the sum of its proper divisors (24218719).

977864681 is a wasteful number, since it uses less digits than its factorization.

977864681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106875.

The product of its digits is 4064256, while the sum is 56.

The square root of 977864681 is about 31270.8279551406. The cubic root of 977864681 is about 992.5664394314.

The spelling of 977864681 in words is "nine hundred seventy-seven million, eight hundred sixty-four thousand, six hundred eighty-one".