639345031750 has 32 divisors (see below), whose sum is σ = 1207834261920. Its totient is φ = 253391781600.

The previous prime is 639345031727. The next prime is 639345031757. The reversal of 639345031750 is 57130543936.

It is a self number, because there is not a number n which added to its sum of digits gives 639345031750.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639345031757) 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, 11703852 + ... + 11758351.

It is an arithmetic number, because the mean of its divisors is an integer number (37744820685).

Almost surely, 2^639345031750 is an apocalyptic number.

639345031750 is a deficient number, since it is larger than the sum of its proper divisors (568489230170).

639345031750 is a wasteful number, since it uses less digits than its factorization.

639345031750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23462329 (or 23462319 counting only the distinct ones).

The product of its (nonzero) digits is 1020600, while the sum is 46.

The spelling of 639345031750 in words is "six hundred thirty-nine billion, three hundred forty-five million, thirty-one thousand, seven hundred fifty".