639260424 has 240 divisors, whose sum is σ = 2039304960. Its totient is φ = 186753600.

The previous prime is 639260423. The next prime is 639260429. The reversal of 639260424 is 424062936.

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

It is not an unprimeable number, because it can be changed into a prime (639260423) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 2430517 + ... + 2430779.

It is an arithmetic number, because the mean of its divisors is an integer number (8497104).

Almost surely, 2^639260424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639260424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1019652480).

639260424 is an abundant number, since it is smaller than the sum of its proper divisors (1400044536).

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

639260424 is a wasteful number, since it uses less digits than its factorization.

639260424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334 (or 310 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 639260424 is about 25283.5999019127. The cubic root of 639260424 is about 861.4417963579.

The spelling of 639260424 in words is "six hundred thirty-nine million, two hundred sixty thousand, four hundred twenty-four".