639258734 has 8 divisors (see below), whose sum is σ = 1000578960. Its totient is φ = 305732416.

The previous prime is 639258733. The next prime is 639258749. The reversal of 639258734 is 437852936.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639258733) by changing a digit.

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, 6948419 + ... + 6948510.

It is an arithmetic number, because the mean of its divisors is an integer number (125072370).

Almost surely, 2^639258734 is an apocalyptic number.

639258734 is a deficient number, since it is larger than the sum of its proper divisors (361320226).

639258734 is a wasteful number, since it uses less digits than its factorization.

639258734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13896954.

The product of its digits is 1088640, while the sum is 47.

The square root of 639258734 is about 25283.5664810169. The cubic root of 639258734 is about 861.4410372317.

The spelling of 639258734 in words is "six hundred thirty-nine million, two hundred fifty-eight thousand, seven hundred thirty-four".