581397480 has 64 divisors (see below), whose sum is σ = 1937995200. Its totient is φ = 155039040.

The previous prime is 581397463. The next prime is 581397493. The reversal of 581397480 is 84793185.

581397480 is a `hidden beast` number, since 5 + 81 + 3 + 97 + 480 = 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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 268086 + ... + 270245.

It is an arithmetic number, because the mean of its divisors is an integer number (30281175).

Almost surely, 2^581397480 is an apocalyptic number.

It is an amenable number.

581397480 is an abundant number, since it is smaller than the sum of its proper divisors (1356597720).

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

581397480 is a wasteful number, since it uses less digits than its factorization.

581397480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538351 (or 538341 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 581397480 is about 24112.1853012123. The cubic root of 581397480 is about 834.6243448698.

The spelling of 581397480 in words is "five hundred eighty-one million, three hundred ninety-seven thousand, four hundred eighty".