640190292 has 48 divisors (see below), whose sum is σ = 1742025600. Its totient is φ = 182910336.

The previous prime is 640190273. The next prime is 640190323. The reversal of 640190292 is 292091046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73653 + ... + 81884.

It is an arithmetic number, because the mean of its divisors is an integer number (36292200).

Almost surely, 2^640190292 is an apocalyptic number.

It is an amenable number.

640190292 is an abundant number, since it is smaller than the sum of its proper divisors (1101835308).

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

640190292 is a wasteful number, since it uses less digits than its factorization.

640190292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155565 (or 155549 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 640190292 is about 25301.9819777029. The cubic root of 640190292 is about 861.8592783170.

The spelling of 640190292 in words is "six hundred forty million, one hundred ninety thousand, two hundred ninety-two".