8657920709 has 4 divisors (see below), whose sum is σ = 8891918604. Its totient is φ = 8423922816.

The previous prime is 8657920697. The next prime is 8657920723. The reversal of 8657920709 is 9070297568.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2960992225 + 5696928484 = 54415^2 + 75478^2 .

It is a cyclic number.

It is not a de Polignac number, because 8657920709 - 2¹² = 8657916613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8657920109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116998892 + ... + 116998965.

It is an arithmetic number, because the mean of its divisors is an integer number (2222979651).

Almost surely, 2^8657920709 is an apocalyptic number.

It is an amenable number.

8657920709 is a deficient number, since it is larger than the sum of its proper divisors (233997895).

8657920709 is a wasteful number, since it uses less digits than its factorization.

8657920709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233997894.

The product of its (nonzero) digits is 1905120, while the sum is 53.

The square root of 8657920709 is about 93047.9484405755. The cubic root of 8657920709 is about 2053.3888591100.

The spelling of 8657920709 in words is "eight billion, six hundred fifty-seven million, nine hundred twenty thousand, seven hundred nine".