641366220 has 48 divisors (see below), whose sum is σ = 1959084288. Its totient is φ = 155482560.

The previous prime is 641366207. The next prime is 641366221. The reversal of 641366220 is 22663146.

641366220 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 2×641366220² = 822701256314176800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (641366221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 485224 + ... + 486543.

It is an arithmetic number, because the mean of its divisors is an integer number (40814256).

Almost surely, 2^641366220 is an apocalyptic number.

641366220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

641366220 is an abundant number, since it is smaller than the sum of its proper divisors (1317718068).

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

641366220 is a wasteful number, since it uses less digits than its factorization.

641366220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 971790 (or 971788 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 641366220 is about 25325.2091797876. The cubic root of 641366220 is about 862.3866551328.

The spelling of 641366220 in words is "six hundred forty-one million, three hundred sixty-six thousand, two hundred twenty".