640066702 has 8 divisors (see below), whose sum is σ = 1047381912. Its totient is φ = 290939400.

The previous prime is 640066697. The next prime is 640066709. The reversal of 640066702 is 207660046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640066709) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 14546949 + ... + 14546992.

It is an arithmetic number, because the mean of its divisors is an integer number (130922739).

Almost surely, 2^640066702 is an apocalyptic number.

640066702 is a deficient number, since it is larger than the sum of its proper divisors (407315210).

640066702 is a wasteful number, since it uses less digits than its factorization.

640066702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29093954.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 640066702 is about 25299.5395610276. The cubic root of 640066702 is about 861.8038135358.

The spelling of 640066702 in words is "six hundred forty million, sixty-six thousand, seven hundred two".