641512872 has 640 divisors, whose sum is σ = 2575964160. Its totient is φ = 143700480.

The previous prime is 641512871. The next prime is 641512877. The reversal of 641512872 is 278215146.

641512872 is a `hidden beast` number, since 64 + 1 + 512 + 87 + 2 = 666.

641512872 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (641512871) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 14918883 + ... + 14918925.

It is an arithmetic number, because the mean of its divisors is an integer number (4024944).

Almost surely, 2^641512872 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 641512872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1287982080).

641512872 is an abundant number, since it is smaller than the sum of its proper divisors (1934451288).

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

641512872 is a wasteful number, since it uses less digits than its factorization.

641512872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115 (or 102 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 641512872 is about 25328.1043901829. The cubic root of 641512872 is about 862.4523799796.

The spelling of 641512872 in words is "six hundred forty-one million, five hundred twelve thousand, eight hundred seventy-two".