2561628892 has 6 divisors (see below), whose sum is σ = 4482850568. Its totient is φ = 1280814444.

The previous prime is 2561628851. The next prime is 2561628919. The reversal of 2561628892 is 2988261652.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320203608 + ... + 320203615.

Almost surely, 2^2561628892 is an apocalyptic number.

It is an amenable number.

2561628892 is a deficient number, since it is larger than the sum of its proper divisors (1921221676).

2561628892 is a wasteful number, since it uses less digits than its factorization.

2561628892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640407227 (or 640407225 counting only the distinct ones).

The product of its digits is 829440, while the sum is 49.

The square root of 2561628892 is about 50612.5369053953. The cubic root of 2561628892 is about 1368.2708381315.

The spelling of 2561628892 in words is "two billion, five hundred sixty-one million, six hundred twenty-eight thousand, eight hundred ninety-two".