2640658960 has 80 divisors (see below), whose sum is σ = 6530582016. Its totient is φ = 989558784.

The previous prime is 2640658927. The next prime is 2640658963. The reversal of 2640658960 is 698560462.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 2640658960.

It is not an unprimeable number, because it can be changed into a prime (2640658963) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 298927 + ... + 307633.

Almost surely, 2^2640658960 is an apocalyptic number.

2640658960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2640658960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3265291008).

2640658960 is an abundant number, since it is smaller than the sum of its proper divisors (3889923056).

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

2640658960 is a wasteful number, since it uses less digits than its factorization.

2640658960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8960 (or 8954 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 46.

The square root of 2640658960 is about 51387.3424103641. The cubic root of 2640658960 is about 1382.1996286706.

The spelling of 2640658960 in words is "two billion, six hundred forty million, six hundred fifty-eight thousand, nine hundred sixty".