641998080 has 216 divisors, whose sum is σ = 2318779008. Its totient is φ = 163688448.

The previous prime is 641998033. The next prime is 641998109. The reversal of 641998080 is 80899146.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 263749 + ... + 266171.

It is an arithmetic number, because the mean of its divisors is an integer number (10735088).

Almost surely, 2^641998080 is an apocalyptic number.

641998080 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 641998080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1159389504).

641998080 is an abundant number, since it is smaller than the sum of its proper divisors (1676780928).

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

641998080 is a wasteful number, since it uses less digits than its factorization.

641998080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2473 (or 2456 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 641998080 is about 25337.6810304337. The cubic root of 641998080 is about 862.6697636851.

The spelling of 641998080 in words is "six hundred forty-one million, nine hundred ninety-eight thousand, eighty".