641551460 has 24 divisors (see below), whose sum is σ = 1469736576. Its totient is φ = 233291360.

The previous prime is 641551459. The next prime is 641551481. The reversal of 641551460 is 64155146.

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, 1457852 + ... + 1458291.

It is an arithmetic number, because the mean of its divisors is an integer number (61239024).

Almost surely, 2^641551460 is an apocalyptic number.

It is an amenable number.

641551460 is an abundant number, since it is smaller than the sum of its proper divisors (828185116).

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

641551460 is a wasteful number, since it uses less digits than its factorization.

641551460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2916163 (or 2916161 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 641551460 is about 25328.8661412231. The cubic root of 641551460 is about 862.4696722515.

It can be divided in two parts, 6415 and 51460, that added together give a palindrome (57875).

The spelling of 641551460 in words is "six hundred forty-one million, five hundred fifty-one thousand, four hundred sixty".