2920644657 has 24 divisors (see below), whose sum is σ = 4919782400. Its totient is φ = 1668938040.

The previous prime is 2920644653. The next prime is 2920644677. The reversal of 2920644657 is 7564460292.

It is not a de Polignac number, because 2920644657 - 2² = 2920644653 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2920644653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 469969 + ... + 476142.

Almost surely, 2^2920644657 is an apocalyptic number.

It is an amenable number.

2920644657 is a deficient number, since it is larger than the sum of its proper divisors (1999137743).

2920644657 is an equidigital number, since it uses as much as digits as its factorization.

2920644657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946138 (or 946121 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The square root of 2920644657 is about 54042.9889717436. The cubic root of 2920644657 is about 1429.4190766364.

The spelling of 2920644657 in words is "two billion, nine hundred twenty million, six hundred forty-four thousand, six hundred fifty-seven".