641156960 has 96 divisors (see below), whose sum is σ = 1544417280. Its totient is φ = 251500032.

The previous prime is 641156951. The next prime is 641156963. The reversal of 641156960 is 69651146.

It is a super-2 number, since 2×641156960² = 822164494712883200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641156963) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2824367 + ... + 2824593.

It is an arithmetic number, because the mean of its divisors is an integer number (16087680).

Almost surely, 2^641156960 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 641156960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (772208640).

641156960 is an abundant number, since it is smaller than the sum of its proper divisors (903260320).

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

641156960 is a wasteful number, since it uses less digits than its factorization.

641156960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508 (or 500 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 641156960 is about 25321.0773862409. The cubic root of 641156960 is about 862.2928539856.

The spelling of 641156960 in words is "six hundred forty-one million, one hundred fifty-six thousand, nine hundred sixty".