639081825480 has 384 divisors, whose sum is σ = 2464379124480. Its totient is φ = 145913840640.

The previous prime is 639081825461. The next prime is 639081825497. The reversal of 639081825480 is 84528180936.

639081825480 is a `hidden beast` number, since 6 + 3 + 9 + 0 + 81 + 82 + 5 + 480 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 67831170 + ... + 67840590.

It is an arithmetic number, because the mean of its divisors is an integer number (6417653970).

Almost surely, 2^639081825480 is an apocalyptic number.

639081825480 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 639081825480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1232189562240).

639081825480 is an abundant number, since it is smaller than the sum of its proper divisors (1825297299000).

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

639081825480 is a wasteful number, since it uses less digits than its factorization.

639081825480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10451 (or 10435 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 54.

The spelling of 639081825480 in words is "six hundred thirty-nine billion, eighty-one million, eight hundred twenty-five thousand, four hundred eighty".