641172870 has 96 divisors (see below), whose sum is σ = 1820119392. Its totient is φ = 155644416.

The previous prime is 641172869. The next prime is 641172887. The reversal of 641172870 is 78271146.

641172870 is a `hidden beast` number, since 641 + 1 + 7 + 2 + 8 + 7 + 0 = 666.

It is a super-2 number, since 2×641172870² = 822205298448073800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 81657 + ... + 89163.

It is an arithmetic number, because the mean of its divisors is an integer number (18959577).

Almost surely, 2^641172870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641172870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (910059696).

641172870 is an abundant number, since it is smaller than the sum of its proper divisors (1178946522).

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

641172870 is a wasteful number, since it uses less digits than its factorization.

641172870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7606 (or 7603 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 641172870 is about 25321.3915494390. The cubic root of 641172870 is about 862.2999863867.

The spelling of 641172870 in words is "six hundred forty-one million, one hundred seventy-two thousand, eight hundred seventy".