640367974 has 8 divisors (see below), whose sum is σ = 962052408. Its totient is φ = 319683840.

The previous prime is 640367953. The next prime is 640367993. The reversal of 640367974 is 479763046.

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

It is a super-2 number, since 2×640367974² = 820142284249729352, which contains 22 as substring.

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, 248472 + ... + 251035.

It is an arithmetic number, because the mean of its divisors is an integer number (120256551).

Almost surely, 2^640367974 is an apocalyptic number.

640367974 is a deficient number, since it is larger than the sum of its proper divisors (321684434).

640367974 is a wasteful number, since it uses less digits than its factorization.

640367974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500150.

The product of its (nonzero) digits is 762048, while the sum is 46.

The square root of 640367974 is about 25305.4929610154. The cubic root of 640367974 is about 861.9390060255.

It can be divided in two parts, 64036 and 7974, that added together give a triangular number (72010 = T₃₇₉).

The spelling of 640367974 in words is "six hundred forty million, three hundred sixty-seven thousand, nine hundred seventy-four".