6640235756 has 48 divisors (see below), whose sum is σ = 14494152960. Its totient is φ = 2585968320.

The previous prime is 6640235753. The next prime is 6640235869. The reversal of 6640235756 is 6575320466.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (6640235753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1168490 + ... + 1174158.

It is an arithmetic number, because the mean of its divisors is an integer number (301961520).

Almost surely, 2^6640235756 is an apocalyptic number.

It is an amenable number.

6640235756 is an abundant number, since it is smaller than the sum of its proper divisors (7853917204).

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

6640235756 is a wasteful number, since it uses less digits than its factorization.

6640235756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9494 (or 9492 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 44.

The square root of 6640235756 is about 81487.6417378734. The cubic root of 6640235756 is about 1879.5815195755.

The spelling of 6640235756 in words is "six billion, six hundred forty million, two hundred thirty-five thousand, seven hundred fifty-six".