640100736 has 96 divisors (see below), whose sum is σ = 2009446920. Its totient is φ = 193966080.

The previous prime is 640100723. The next prime is 640100737. The reversal of 640100736 is 637001046.

640100736 is a `hidden beast` number, since 640 + 10 + 0 + 7 + 3 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640100737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12585 + ... + 37928.

Almost surely, 2^640100736 is an apocalyptic number.

640100736 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

640100736 is an abundant number, since it is smaller than the sum of its proper divisors (1369346184).

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

640100736 is a wasteful number, since it uses less digits than its factorization.

640100736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50544 (or 50529 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 640100736 is about 25300.2121730234. The cubic root of 640100736 is about 861.8190880434.

The spelling of 640100736 in words is "six hundred forty million, one hundred thousand, seven hundred thirty-six".