2640456168 has 32 divisors (see below), whose sum is σ = 7544160960. Its totient is φ = 754416000.

The previous prime is 2640456157. The next prime is 2640456199. The reversal of 2640456168 is 8616540462.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 7858333 + ... + 7858668.

It is an arithmetic number, because the mean of its divisors is an integer number (235755030).

Almost surely, 2^2640456168 is an apocalyptic number.

2640456168 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2640456168 is an abundant number, since it is smaller than the sum of its proper divisors (4903704792).

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

2640456168 is a wasteful number, since it uses less digits than its factorization.

2640456168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15717017 (or 15717013 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 42.

The square root of 2640456168 is about 51385.3692017485. The cubic root of 2640456168 is about 1382.1642453052.

The spelling of 2640456168 in words is "two billion, six hundred forty million, four hundred fifty-six thousand, one hundred sixty-eight".