564861638 has 12 divisors (see below), whose sum is σ = 931321860. Its totient is φ = 256755180.

The previous prime is 564861617. The next prime is 564861679. The reversal of 564861638 is 836168465.

It is a junction number, because it is equal to n+sod(n) for n = 564861592 and 564861601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1166828 + ... + 1167311.

It is an arithmetic number, because the mean of its divisors is an integer number (77610155).

Almost surely, 2^564861638 is an apocalyptic number.

564861638 is a deficient number, since it is larger than the sum of its proper divisors (366460222).

564861638 is a wasteful number, since it uses less digits than its factorization.

564861638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2334163 (or 2334152 counting only the distinct ones).

The product of its digits is 829440, while the sum is 47.

The square root of 564861638 is about 23766.8180032582. The cubic root of 564861638 is about 826.6354520891.

The spelling of 564861638 in words is "five hundred sixty-four million, eight hundred sixty-one thousand, six hundred thirty-eight".