2560400660 has 24 divisors (see below), whose sum is σ = 5406555336. Its totient is φ = 1018500480.

The previous prime is 2560400659. The next prime is 2560400671. The reversal of 2560400660 is 660040652.

It can be written as a sum of positive squares in 4 ways, for example, as 191047684 + 2369352976 = 13822^2 + 48676^2 .

It is a congruent number.

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, 350027 + ... + 357266.

It is an arithmetic number, because the mean of its divisors is an integer number (225273139).

Almost surely, 2^2560400660 is an apocalyptic number.

2560400660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2560400660 is an abundant number, since it is smaller than the sum of its proper divisors (2846154676).

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

2560400660 is a wasteful number, since it uses less digits than its factorization.

2560400660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707483 (or 707481 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 2560400660 is about 50600.4017770610. The cubic root of 2560400660 is about 1368.0521201772.

The spelling of 2560400660 in words is "two billion, five hundred sixty million, four hundred thousand, six hundred sixty".