678424581 has 12 divisors (see below), whose sum is σ = 1003848300. Its totient is φ = 441251520.

The previous prime is 678424567. The next prime is 678424597. The reversal of 678424581 is 185424876.

678424581 is a `hidden beast` number, since 67 + 8 + 4 + 2 + 4 + 581 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12320100 + 666104481 = 3510^2 + 25809^2 .

It is not a de Polignac number, because 678424581 - 2²¹ = 676327429 is a prime.

It is a super-2 number, since 2×678424581² = 920519824210051122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678424501) 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, 918906 + ... + 919643.

It is an arithmetic number, because the mean of its divisors is an integer number (83654025).

Almost surely, 2^678424581 is an apocalyptic number.

It is an amenable number.

678424581 is a deficient number, since it is larger than the sum of its proper divisors (325423719).

678424581 is a wasteful number, since it uses less digits than its factorization.

678424581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1838596 (or 1838593 counting only the distinct ones).

The product of its digits is 430080, while the sum is 45.

The square root of 678424581 is about 26046.5848241185. The cubic root of 678424581 is about 878.6863064651.

The spelling of 678424581 in words is "six hundred seventy-eight million, four hundred twenty-four thousand, five hundred eighty-one".