641329880 has 64 divisors (see below), whose sum is σ = 1493281440. Its totient is φ = 247698432.

The previous prime is 641329877. The next prime is 641329903. The reversal of 641329880 is 88923146.

It is a super-2 number, since 2×641329880² = 822608029961628800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201179 + ... + 204341.

Almost surely, 2^641329880 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641329880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (746640720).

641329880 is an abundant number, since it is smaller than the sum of its proper divisors (851951560).

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

641329880 is a wasteful number, since it uses less digits than its factorization.

641329880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3348 (or 3344 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 641329880 is about 25324.4917026976. The cubic root of 641329880 is about 862.3703671307.

The spelling of 641329880 in words is "six hundred forty-one million, three hundred twenty-nine thousand, eight hundred eighty".