639714240 has 448 divisors, whose sum is σ = 2528133120. Its totient is φ = 150958080.

The previous prime is 639714223. The next prime is 639714247. The reversal of 639714240 is 42417936.

639714240 is a `hidden beast` number, since 639 + 7 + 14 + 2 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 639714195 and 639714204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639714247) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5037057 + ... + 5037183.

Almost surely, 2^639714240 is an apocalyptic number.

639714240 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 639714240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1264066560).

639714240 is an abundant number, since it is smaller than the sum of its proper divisors (1888418880).

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

639714240 is a wasteful number, since it uses less digits than its factorization.

639714240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217 (or 201 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 639714240 is about 25292.5728228664. The cubic root of 639714240 is about 861.6455962400.

The spelling of 639714240 in words is "six hundred thirty-nine million, seven hundred fourteen thousand, two hundred forty".