640352000 has 72 divisors (see below), whose sum is σ = 1595276592. Its totient is φ = 256128000.

The previous prime is 640351997. The next prime is 640352021. The reversal of 640352000 is 253046.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21995 + ... + 42005.

Almost surely, 2^640352000 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 640352000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (797638296).

640352000 is an abundant number, since it is smaller than the sum of its proper divisors (954924592).

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

640352000 is an equidigital number, since it uses as much as digits as its factorization.

640352000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20042 (or 20018 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 640352000 is about 25305.1773358734. The cubic root of 640352000 is about 861.9318389337.

The spelling of 640352000 in words is "six hundred forty million, three hundred fifty-two thousand".