2643657920 has 56 divisors (see below), whose sum is σ = 6305025744. Its totient is φ = 1055814656.

The previous prime is 2643657889. The next prime is 2643657971. The reversal of 2643657920 is 297563462.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 210539 + ... + 222741.

Almost surely, 2^2643657920 is an apocalyptic number.

2643657920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2643657920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3152512872).

2643657920 is an abundant number, since it is smaller than the sum of its proper divisors (3661367824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2643657920 is a wasteful number, since it uses less digits than its factorization.

2643657920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12897 (or 12887 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 44.

The square root of 2643657920 is about 51416.5140786499. The cubic root of 2643657920 is about 1382.7226790720.

The spelling of 2643657920 in words is "two billion, six hundred forty-three million, six hundred fifty-seven thousand, nine hundred twenty".