641156880 has 320 divisors, whose sum is σ = 2527838208. Its totient is φ = 130775040.

The previous prime is 641156869. The next prime is 641156891. The reversal of 641156880 is 88651146.

It is an interprime number because it is at equal distance from previous prime (641156869) and next prime (641156891).

It is a super-2 number, since 2×641156880² = 822164289542668800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 676567 + ... + 677513.

Almost surely, 2^641156880 is an apocalyptic number.

641156880 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 641156880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1263919104).

641156880 is an abundant number, since it is smaller than the sum of its proper divisors (1886681328).

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

641156880 is a wasteful number, since it uses less digits than its factorization.

641156880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014 (or 1008 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 641156880 is about 25321.0758065292. The cubic root of 641156880 is about 862.2928181215.

The spelling of 641156880 in words is "six hundred forty-one million, one hundred fifty-six thousand, eight hundred eighty".