641877180 has 96 divisors (see below), whose sum is σ = 2078866944. Its totient is φ = 144939264.

The previous prime is 641877163. The next prime is 641877217. The reversal of 641877180 is 81778146.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25654 + ... + 44066.

It is an arithmetic number, because the mean of its divisors is an integer number (21654864).

Almost surely, 2^641877180 is an apocalyptic number.

641877180 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641877180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1039433472).

641877180 is an abundant number, since it is smaller than the sum of its proper divisors (1436989764).

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

641877180 is a wasteful number, since it uses less digits than its factorization.

641877180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18515 (or 18513 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 42.

The square root of 641877180 is about 25335.2951433371. The cubic root of 641877180 is about 862.6156081119.

The spelling of 641877180 in words is "six hundred forty-one million, eight hundred seventy-seven thousand, one hundred eighty".