641247200 has 72 divisors (see below), whose sum is σ = 1707781320. Its totient is φ = 233177600.

The previous prime is 641247197. The next prime is 641247209. The reversal of 641247200 is 2742146.

It is a super-2 number, since 2×641247200² = 822395943015680000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 641247200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641247209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27635 + ... + 45234.

It is an arithmetic number, because the mean of its divisors is an integer number (23719185).

Almost surely, 2^641247200 is an apocalyptic number.

It is an amenable number.

641247200 is an abundant number, since it is smaller than the sum of its proper divisors (1066534120).

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

641247200 is a wasteful number, since it uses less digits than its factorization.

641247200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72900 (or 72887 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 641247200 is about 25322.8592382456. The cubic root of 641247200 is about 862.3333067201. Note that the first 4 decimals are identical.

Adding to 641247200 its reverse (2742146), we get a palindrome (643989346).

The spelling of 641247200 in words is "six hundred forty-one million, two hundred forty-seven thousand, two hundred".