639351467040 has 768 divisors, whose sum is σ = 2420605845504. Its totient is φ = 139810406400.

The previous prime is 639351467039. The next prime is 639351467071. The reversal of 639351467040 is 40764153936.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 618926364 + ... + 618927396.

It is an arithmetic number, because the mean of its divisors is an integer number (3151830528).

Almost surely, 2^639351467040 is an apocalyptic number.

639351467040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639351467040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1210302922752).

639351467040 is an abundant number, since it is smaller than the sum of its proper divisors (1781254378464).

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

639351467040 is a wasteful number, since it uses less digits than its factorization.

639351467040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1273 (or 1265 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 48.

The spelling of 639351467040 in words is "six hundred thirty-nine billion, three hundred fifty-one million, four hundred sixty-seven thousand, forty".