639152774 has 32 divisors (see below), whose sum is σ = 1118668320. Its totient is φ = 271176192.

The previous prime is 639152771. The next prime is 639152797. The reversal of 639152774 is 477251936.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639152771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2192 + ... + 35820.

It is an arithmetic number, because the mean of its divisors is an integer number (34958385).

Almost surely, 2^639152774 is an apocalyptic number.

639152774 is a deficient number, since it is larger than the sum of its proper divisors (479515546).

639152774 is a wasteful number, since it uses less digits than its factorization.

639152774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33704.

The product of its digits is 317520, while the sum is 44.

The square root of 639152774 is about 25281.4709619516. The cubic root of 639152774 is about 861.3934386976.

The spelling of 639152774 in words is "six hundred thirty-nine million, one hundred fifty-two thousand, seven hundred seventy-four".