2640489660 has 72 divisors (see below), whose sum is σ = 8431048080. Its totient is φ = 667070208.

The previous prime is 2640489653. The next prime is 2640489727. The reversal of 2640489660 is 669840462.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 382617 + ... + 389456.

It is an arithmetic number, because the mean of its divisors is an integer number (117097890).

Almost surely, 2^2640489660 is an apocalyptic number.

2640489660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2640489660 is an abundant number, since it is smaller than the sum of its proper divisors (5790558420).

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

2640489660 is a wasteful number, since it uses less digits than its factorization.

2640489660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772107 (or 772102 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The square root of 2640489660 is about 51385.6950911438. The cubic root of 2640489660 is about 1382.1700891501.

The spelling of 2640489660 in words is "two billion, six hundred forty million, four hundred eighty-nine thousand, six hundred sixty".