640071702 has 24 divisors (see below), whose sum is σ = 1434644640. Its totient is φ = 205999920.

The previous prime is 640071683. The next prime is 640071721. The reversal of 640071702 is 207170046.

640071702 is a `hidden beast` number, since 640 + 0 + 7 + 17 + 0 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (640071683) and next prime (640071721).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 612574 + ... + 613617.

It is an arithmetic number, because the mean of its divisors is an integer number (59776860).

Almost surely, 2^640071702 is an apocalyptic number.

640071702 is an abundant number, since it is smaller than the sum of its proper divisors (794572938).

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

640071702 is a wasteful number, since it uses less digits than its factorization.

640071702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1226228 (or 1226225 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 640071702 is about 25299.6383768622. The cubic root of 640071702 is about 861.8060575768.

The spelling of 640071702 in words is "six hundred forty million, seventy-one thousand, seven hundred two".