2640849460 has 24 divisors (see below), whose sum is σ = 5621756616. Its totient is φ = 1041868800.

The previous prime is 2640849457. The next prime is 2640849481. The reversal of 2640849460 is 649480462.

It can be written as a sum of positive squares in 4 ways, for example, as 452668176 + 2188181284 = 21276^2 + 46778^2 .

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

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, 902941 + ... + 905860.

It is an arithmetic number, because the mean of its divisors is an integer number (234239859).

Almost surely, 2^2640849460 is an apocalyptic number.

2640849460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2640849460 is an abundant number, since it is smaller than the sum of its proper divisors (2980907156).

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

2640849460 is a wasteful number, since it uses less digits than its factorization.

2640849460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1808883 (or 1808881 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 43.

The square root of 2640849460 is about 51389.1959462298. The cubic root of 2640849460 is about 1382.2328656646.

The spelling of 2640849460 in words is "two billion, six hundred forty million, eight hundred forty-nine thousand, four hundred sixty".