640335692 has 12 divisors (see below), whose sum is σ = 1122402120. Its totient is φ = 319649376.

The previous prime is 640335677. The next prime is 640335697. The reversal of 640335692 is 296533046.

It is not an unprimeable number, because it can be changed into a prime (640335697) 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, 126833 + ... + 131784.

It is an arithmetic number, because the mean of its divisors is an integer number (93533510).

Almost surely, 2^640335692 is an apocalyptic number.

It is an amenable number.

640335692 is a deficient number, since it is larger than the sum of its proper divisors (482066428).

640335692 is a wasteful number, since it uses less digits than its factorization.

640335692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259240 (or 259238 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 38.

The square root of 640335692 is about 25304.8551072714. The cubic root of 640335692 is about 861.9245218624.

The spelling of 640335692 in words is "six hundred forty million, three hundred thirty-five thousand, six hundred ninety-two".