641221080 has 32 divisors (see below), whose sum is σ = 1923663600. Its totient is φ = 170992256.

The previous prime is 641221069. The next prime is 641221103. The reversal of 641221080 is 80122146.

It is a super-2 number, since 2×641221080² = 822328946872732800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 641221080.

It is a congruent number.

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, 2671635 + ... + 2671874.

Almost surely, 2^641221080 is an apocalyptic number.

641221080 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

641221080 is an abundant number, since it is smaller than the sum of its proper divisors (1282442520).

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

641221080 is a wasteful number, since it uses less digits than its factorization.

641221080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5343523 (or 5343519 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 641221080 is about 25322.3434934447. The cubic root of 641221080 is about 862.3215980520.

The spelling of 641221080 in words is "six hundred forty-one million, two hundred twenty-one thousand, eighty".