640465622 has 8 divisors (see below), whose sum is σ = 963207936. Its totient is φ = 319396312.

The previous prime is 640465603. The next prime is 640465649. The reversal of 640465622 is 226564046.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 417293 + ... + 418824.

It is an arithmetic number, because the mean of its divisors is an integer number (120400992).

Almost surely, 2^640465622 is an apocalyptic number.

640465622 is a deficient number, since it is larger than the sum of its proper divisors (322742314).

640465622 is a wasteful number, since it uses less digits than its factorization.

640465622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836502.

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 640465622 is about 25307.4222709465. The cubic root of 640465622 is about 861.9828153902.

The spelling of 640465622 in words is "six hundred forty million, four hundred sixty-five thousand, six hundred twenty-two".