2640156736 has 56 divisors (see below), whose sum is σ = 5993359616. Its totient is φ = 1130388480.

The previous prime is 2640156733. The next prime is 2640156737. The reversal of 2640156736 is 6376510462.

It is a tau number, because it is divible by the number of its divisors (56).

It is not an unprimeable number, because it can be changed into a prime (2640156733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 592276 + ... + 596716.

Almost surely, 2^2640156736 is an apocalyptic number.

It is an amenable number.

2640156736 is an abundant number, since it is smaller than the sum of its proper divisors (3353202880).

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

2640156736 is a wasteful number, since it uses less digits than its factorization.

2640156736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5787 (or 5777 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 2640156736 is about 51382.4555271544. The cubic root of 2640156736 is about 1382.1119967765. Note that the first 3 decimals are identical.

The spelling of 2640156736 in words is "two billion, six hundred forty million, one hundred fifty-six thousand, seven hundred thirty-six".