640294143840 has 192 divisors, whose sum is σ = 2413416600000. Its totient is φ = 157610852352.

The previous prime is 640294143823. The next prime is 640294143911. The reversal of 640294143840 is 48341492046.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5644465 + ... + 5756784.

It is an arithmetic number, because the mean of its divisors is an integer number (12569878125).

Almost surely, 2^640294143840 is an apocalyptic number.

640294143840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

640294143840 is an abundant number, since it is smaller than the sum of its proper divisors (1773122456160).

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

640294143840 is a wasteful number, since it uses less digits than its factorization.

640294143840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11401286 (or 11401272 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 45.

The spelling of 640294143840 in words is "six hundred forty billion, two hundred ninety-four million, one hundred forty-three thousand, eight hundred forty".