640094667840 has 224 divisors, whose sum is σ = 2390942396160. Its totient is φ = 160651173888.

The previous prime is 640094667763. The next prime is 640094667851. The reversal of 640094667840 is 48766490046.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2032092 + ... + 2325851.

Almost surely, 2^640094667840 is an apocalyptic number.

640094667840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

640094667840 is an abundant number, since it is smaller than the sum of its proper divisors (1750847728320).

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

640094667840 is a wasteful number, since it uses less digits than its factorization.

640094667840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4357986 (or 4357970 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 54.

The spelling of 640094667840 in words is "six hundred forty billion, ninety-four million, six hundred sixty-seven thousand, eight hundred forty".