641331560 has 32 divisors (see below), whose sum is σ = 1457015040. Its totient is φ = 254040384.

The previous prime is 641331533. The next prime is 641331583. The reversal of 641331560 is 65133146.

It is a happy number.

641331560 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×641331560² = 822612339704067200, which contains 22 as substring.

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, 73712 + ... + 81951.

It is an arithmetic number, because the mean of its divisors is an integer number (45531720).

Almost surely, 2^641331560 is an apocalyptic number.

It is an amenable number.

641331560 is an abundant number, since it is smaller than the sum of its proper divisors (815683480).

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

641331560 is a wasteful number, since it uses less digits than its factorization.

641331560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155777 (or 155773 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 641331560 is about 25324.5248721472. The cubic root of 641331560 is about 862.3711201395.

It can be divided in two parts, 6413 and 31560, that added together give a palindrome (37973).

The spelling of 641331560 in words is "six hundred forty-one million, three hundred thirty-one thousand, five hundred sixty".