640765702 has 8 divisors (see below), whose sum is σ = 966459312. Its totient is φ = 318612600.

The previous prime is 640765693. The next prime is 640765721. The reversal of 640765702 is 207567046.

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

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 3 ways as a sum of consecutive naturals, for example, 884674 + ... + 885397.

It is an arithmetic number, because the mean of its divisors is an integer number (120807414).

Almost surely, 2^640765702 is an apocalyptic number.

640765702 is a deficient number, since it is larger than the sum of its proper divisors (325693610).

640765702 is a wasteful number, since it uses less digits than its factorization.

640765702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1770254.

The product of its (nonzero) digits is 70560, while the sum is 37.

The square root of 640765702 is about 25313.3502721390. The cubic root of 640765702 is about 862.1174171587.

The spelling of 640765702 in words is "six hundred forty million, seven hundred sixty-five thousand, seven hundred two".