581379660 has 96 divisors (see below), whose sum is σ = 1847301120. Its totient is φ = 151729344.

The previous prime is 581379653. The next prime is 581379677. The reversal of 581379660 is 66973185.

It is a happy number.

581379660 is a `hidden beast` number, since 581 + 3 + 7 + 9 + 6 + 60 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 31 ways as a sum of consecutive naturals, for example, 13927 + ... + 36833.

It is an arithmetic number, because the mean of its divisors is an integer number (19242720).

Almost surely, 2^581379660 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 581379660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (923650560).

581379660 is an abundant number, since it is smaller than the sum of its proper divisors (1265921460).

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

581379660 is a wasteful number, since it uses less digits than its factorization.

581379660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22972 (or 22964 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 581379660 is about 24111.8157756731. The cubic root of 581379660 is about 834.6158176239.

The spelling of 581379660 in words is "five hundred eighty-one million, three hundred seventy-nine thousand, six hundred sixty".