581671872 has 84 divisors (see below), whose sum is σ = 1670706336. Its totient is φ = 193489920.

The previous prime is 581671861. The next prime is 581671877. The reversal of 581671872 is 278176185.

It is a happy number.

581671872 is a `hidden beast` number, since 581 + 67 + 1 + 8 + 7 + 2 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (581671877) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 437673 + ... + 438999.

Almost surely, 2^581671872 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 581671872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (835353168).

581671872 is an abundant number, since it is smaller than the sum of its proper divisors (1089034464).

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

581671872 is a wasteful number, since it uses less digits than its factorization.

581671872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2106 (or 2093 counting only the distinct ones).

The product of its digits is 188160, while the sum is 45.

The square root of 581671872 is about 24117.8745332171. The cubic root of 581671872 is about 834.7556252374.

The spelling of 581671872 in words is "five hundred eighty-one million, six hundred seventy-one thousand, eight hundred seventy-two".