639760390830 has 448 divisors, whose sum is σ = 1921491901440. Its totient is φ = 151995916800.

The previous prime is 639760390817. The next prime is 639760390831. The reversal of 639760390830 is 38093067936.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639760390831) by changing a digit.

It is a polite number, since it can be written in 223 ways as a sum of consecutive naturals, for example, 1782062191 + ... + 1782062549.

Almost surely, 2^639760390830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639760390830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (960745950720).

639760390830 is an abundant number, since it is smaller than the sum of its proper divisors (1281731510610).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

639760390830 is a wasteful number, since it uses less digits than its factorization.

639760390830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779 (or 764 counting only the distinct ones).

The product of its (nonzero) digits is 4408992, while the sum is 54.

The spelling of 639760390830 in words is "six hundred thirty-nine billion, seven hundred sixty million, three hundred ninety thousand, eight hundred thirty".