639958080 has 224 divisors, whose sum is σ = 2130186240. Its totient is φ = 162570240.

The previous prime is 639958043. The next prime is 639958117. The reversal of 639958080 is 80859936.

It is an interprime number because it is at equal distance from previous prime (639958043) and next prime (639958117).

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 31 ways as a sum of consecutive naturals, for example, 3535590 + ... + 3535770.

It is an arithmetic number, because the mean of its divisors is an integer number (9509760).

Almost surely, 2^639958080 is an apocalyptic number.

639958080 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 639958080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1065093120).

639958080 is an abundant number, since it is smaller than the sum of its proper divisors (1490228160).

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

639958080 is a wasteful number, since it uses less digits than its factorization.

639958080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357 (or 347 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 48.

The square root of 639958080 is about 25297.3927510327. The cubic root of 639958080 is about 861.7550602056.

The spelling of 639958080 in words is "six hundred thirty-nine million, nine hundred fifty-eight thousand, eighty".