641615200 has 36 divisors (see below), whose sum is σ = 1566345060. Its totient is φ = 256645760.

The previous prime is 641615179. The next prime is 641615201. The reversal of 641615200 is 2516146.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641615201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 400210 + ... + 401809.

It is an arithmetic number, because the mean of its divisors is an integer number (43509585).

Almost surely, 2^641615200 is an apocalyptic number.

It is an amenable number.

641615200 is an abundant number, since it is smaller than the sum of its proper divisors (924729860).

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

641615200 is a wasteful number, since it uses less digits than its factorization.

641615200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802039 (or 802026 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 641615200 is about 25330.1243581630. The cubic root of 641615200 is about 862.4982342609.

The spelling of 641615200 in words is "six hundred forty-one million, six hundred fifteen thousand, two hundred".