640470676 has 24 divisors (see below), whose sum is σ = 1152809280. Its totient is φ = 311160000.

The previous prime is 640470647. The next prime is 640470707. The reversal of 640470676 is 676074046.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33385 + ... + 48943.

It is an arithmetic number, because the mean of its divisors is an integer number (48033720).

Almost surely, 2^640470676 is an apocalyptic number.

It is an amenable number.

640470676 is a deficient number, since it is larger than the sum of its proper divisors (512338604).

640470676 is a wasteful number, since it uses less digits than its factorization.

640470676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15855 (or 15853 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 40.

The square root of 640470676 is about 25307.5221228788. The cubic root of 640470676 is about 861.9850827248.

It can be divided in two parts, 640470 and 676, that added together give a palindrome (641146).

The spelling of 640470676 in words is "six hundred forty million, four hundred seventy thousand, six hundred seventy-six".