640074394 has 8 divisors (see below), whose sum is σ = 1010643840. Its totient is φ = 303193116.

The previous prime is 640074373. The next prime is 640074419. The reversal of 640074394 is 493470046.

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

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, 8421994 + ... + 8422069.

It is an arithmetic number, because the mean of its divisors is an integer number (126330480).

Almost surely, 2^640074394 is an apocalyptic number.

640074394 is a deficient number, since it is larger than the sum of its proper divisors (370569446).

640074394 is a wasteful number, since it uses less digits than its factorization.

640074394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16844084.

The product of its (nonzero) digits is 72576, while the sum is 37.

The square root of 640074394 is about 25299.6915791478. The cubic root of 640074394 is about 861.8072657637.

The spelling of 640074394 in words is "six hundred forty million, seventy-four thousand, three hundred ninety-four".