641491200 has 648 divisors, whose sum is σ = 2754559808. Its totient is φ = 139345920.

The previous prime is 641491159. The next prime is 641491211. The reversal of 641491200 is 2194146.

641491200 is a `hidden beast` number, since 641 + 4 + 9 + 12 + 0 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 14918379 + ... + 14918421.

Almost surely, 2^641491200 is an apocalyptic number.

641491200 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 641491200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1377279904).

641491200 is an abundant number, since it is smaller than the sum of its proper divisors (2113068608).

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

641491200 is a wasteful number, since it uses less digits than its factorization.

641491200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119 (or 97 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 641491200 is about 25327.6765614219. The cubic root of 641491200 is about 862.4426678967.

The spelling of 641491200 in words is "six hundred forty-one million, four hundred ninety-one thousand, two hundred".