639070986240 has 336 divisors, whose sum is σ = 2291739231600. Its totient is φ = 164539662336.

The previous prime is 639070986223. The next prime is 639070986277. The reversal of 639070986240 is 42689070936.

It is a happy number.

639070986240 is a `hidden beast` number, since 6 + 3 + 9 + 0 + 7 + 0 + 9 + 8 + 624 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10660671 + ... + 10720449.

It is an arithmetic number, because the mean of its divisors is an integer number (6820652475).

Almost surely, 2^639070986240 is an apocalyptic number.

639070986240 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 639070986240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1145869615800).

639070986240 is an abundant number, since it is smaller than the sum of its proper divisors (1652668245360).

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

639070986240 is a wasteful number, since it uses less digits than its factorization.

639070986240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59845 (or 59818 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 54.

The spelling of 639070986240 in words is "six hundred thirty-nine billion, seventy million, nine hundred eighty-six thousand, two hundred forty".