1641820180 has 96 divisors (see below), whose sum is σ = 4629300480. Its totient is φ = 472366080.

The previous prime is 1641820163. The next prime is 1641820183. The reversal of 1641820180 is 810281461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641820183) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20985 + ... + 61024.

It is an arithmetic number, because the mean of its divisors is an integer number (48221880).

Almost surely, 2^1641820180 is an apocalyptic number.

1641820180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1641820180 is an abundant number, since it is smaller than the sum of its proper divisors (2987480300).

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

1641820180 is a wasteful number, since it uses less digits than its factorization.

1641820180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82049 (or 82047 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 1641820180 is about 40519.3803012830. The cubic root of 1641820180 is about 1179.7098252302.

The spelling of 1641820180 in words is "one billion, six hundred forty-one million, eight hundred twenty thousand, one hundred eighty".