581216364 has 48 divisors (see below), whose sum is σ = 1527519840. Its totient is φ = 191082240.

The previous prime is 581216359. The next prime is 581216413. The reversal of 581216364 is 463612185.

It is a happy number.

581216364 is a `hidden beast` number, since 5 + 8 + 12 + 1 + 636 + 4 = 666.

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

It is a zygodrome in base 3.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28977 + ... + 44744.

It is an arithmetic number, because the mean of its divisors is an integer number (31823330).

Almost surely, 2^581216364 is an apocalyptic number.

581216364 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

581216364 is an abundant number, since it is smaller than the sum of its proper divisors (946303476).

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

581216364 is a wasteful number, since it uses less digits than its factorization.

581216364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73807 (or 73799 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 581216364 is about 24108.4293142461. The cubic root of 581216364 is about 834.5376689280.

The spelling of 581216364 in words is "five hundred eighty-one million, two hundred sixteen thousand, three hundred sixty-four".