640002992 has 20 divisors (see below), whose sum is σ = 1305269880. Its totient is φ = 303159168.

The previous prime is 640002971. The next prime is 640002997. The reversal of 640002992 is 299200046.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (640002997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1052333 + ... + 1052940.

It is an arithmetic number, because the mean of its divisors is an integer number (65263494).

Almost surely, 2^640002992 is an apocalyptic number.

It is an amenable number.

640002992 is an abundant number, since it is smaller than the sum of its proper divisors (665266888).

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

640002992 is a wasteful number, since it uses less digits than its factorization.

640002992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2105300 (or 2105294 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 640002992 is about 25298.2804158702. The cubic root of 640002992 is about 861.7752189416.

The spelling of 640002992 in words is "six hundred forty million, two thousand, nine hundred ninety-two".