640287142872 has 32 divisors (see below), whose sum is σ = 1723850000880. Its totient is φ = 197011428480.

The previous prime is 640287142837. The next prime is 640287142919. The reversal of 640287142872 is 278241782046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1026100879 + ... + 1026101502.

Almost surely, 2^640287142872 is an apocalyptic number.

It is an amenable number.

640287142872 is an abundant number, since it is smaller than the sum of its proper divisors (1083562858008).

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

640287142872 is a wasteful number, since it uses less digits than its factorization.

640287142872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2052202403 (or 2052202399 counting only the distinct ones).

The product of its (nonzero) digits is 2408448, while the sum is 51.

It can be divided in two parts, 64028714 and 2872, that added together give a triangular number (64031586 = T₁₁₃₁₆).

The spelling of 640287142872 in words is "six hundred forty billion, two hundred eighty-seven million, one hundred forty-two thousand, eight hundred seventy-two".