2600400640 has 36 divisors (see below), whose sum is σ = 6228775224. Its totient is φ = 1040159744.

The previous prime is 2600400617. The next prime is 2600400679. The reversal of 2600400640 is 460040062.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1014502 + ... + 1017061.

It is an arithmetic number, because the mean of its divisors is an integer number (173021534).

Almost surely, 2^2600400640 is an apocalyptic number.

2600400640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2600400640 is an abundant number, since it is smaller than the sum of its proper divisors (3628374584).

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

2600400640 is an equidigital number, since it uses as much as digits as its factorization.

2600400640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2031584 (or 2031570 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 2600400640 is about 50994.1235830169. The cubic root of 2600400640 is about 1375.1394926250.

The spelling of 2600400640 in words is "two billion, six hundred million, four hundred thousand, six hundred forty".