7977362689 has 8 divisors (see below), whose sum is σ = 8274089448. Its totient is φ = 7684905600.

The previous prime is 7977362677. The next prime is 7977362699. The reversal of 7977362689 is 9862637797.

It can be written as a sum of positive squares in 4 ways, for example, as 4407897664 + 3569465025 = 66392^2 + 59745^2 .

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 7977362689 - 2²³ = 7968974081 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7977362689.

It is not an unprimeable number, because it can be changed into a prime (7977362699) 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, 1063612 + ... + 1071085.

It is an arithmetic number, because the mean of its divisors is an integer number (1034261181).

Almost surely, 2^7977362689 is an apocalyptic number.

It is an amenable number.

7977362689 is a deficient number, since it is larger than the sum of its proper divisors (296726759).

7977362689 is a wasteful number, since it uses less digits than its factorization.

7977362689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2134835.

The product of its digits is 48009024, while the sum is 64.

The square root of 7977362689 is about 89316.0830365954. The cubic root of 7977362689 is about 1998.1117752814. Note that the first 3 decimals are identical.

The spelling of 7977362689 in words is "seven billion, nine hundred seventy-seven million, three hundred sixty-two thousand, six hundred eighty-nine".