639488700 has 108 divisors (see below), whose sum is σ = 2109995160. Its totient is φ = 161550720.

The previous prime is 639488659. The next prime is 639488701. The reversal of 639488700 is 7884936.

It is a happy number.

639488700 is a `hidden beast` number, since 639 + 4 + 8 + 8 + 7 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639488701) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1599 + ... + 35798.

Almost surely, 2^639488700 is an apocalyptic number.

639488700 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 639488700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1054997580).

639488700 is an abundant number, since it is smaller than the sum of its proper divisors (1470506460).

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

639488700 is a wasteful number, since it uses less digits than its factorization.

639488700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37436 (or 37426 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 639488700 is about 25288.1138086651. The cubic root of 639488700 is about 861.5443226928.

The spelling of 639488700 in words is "six hundred thirty-nine million, four hundred eighty-eight thousand, seven hundred".