640059194 has 8 divisors (see below), whose sum is σ = 1010619840. Its totient is φ = 303185916.

The previous prime is 640059181. The next prime is 640059209. The reversal of 640059194 is 491950046.

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

It is a Harshad number since it is a multiple of its sum of digits (38), and also a Moran number because the ratio is a prime number: 16843663 = 640059194 / (6 + 4 + 0 + 0 + 5 + 9 + 1 + 9 + 4).

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, 8421794 + ... + 8421869.

It is an arithmetic number, because the mean of its divisors is an integer number (126327480).

Almost surely, 2^640059194 is an apocalyptic number.

640059194 is a deficient number, since it is larger than the sum of its proper divisors (370560646).

640059194 is a wasteful number, since it uses less digits than its factorization.

640059194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16843684.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 640059194 is about 25299.3911784454. The cubic root of 640059194 is about 861.8004438618.

The spelling of 640059194 in words is "six hundred forty million, fifty-nine thousand, one hundred ninety-four".