639053220 has 288 divisors, whose sum is σ = 2125025280. Its totient is φ = 142871040.

The previous prime is 639053213. The next prime is 639053227. The reversal of 639053220 is 22350936.

It is an interprime number because it is at equal distance from previous prime (639053213) and next prime (639053227).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (639053227) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5972407 + ... + 5972513.

It is an arithmetic number, because the mean of its divisors is an integer number (7378560).

Almost surely, 2^639053220 is an apocalyptic number.

639053220 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 639053220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1062512640).

639053220 is an abundant number, since it is smaller than the sum of its proper divisors (1485972060).

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

639053220 is a wasteful number, since it uses less digits than its factorization.

639053220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195 (or 180 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 30.

The square root of 639053220 is about 25279.5019729424. The cubic root of 639053220 is about 861.3487130239.

The spelling of 639053220 in words is "six hundred thirty-nine million, fifty-three thousand, two hundred twenty".