561770728 has 16 divisors (see below), whose sum is σ = 1058837760. Its totient is φ = 279414000.

The previous prime is 561770717. The next prime is 561770731. The reversal of 561770728 is 827077165.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182298 + ... + 185353.

It is an arithmetic number, because the mean of its divisors is an integer number (66177360).

Almost surely, 2^561770728 is an apocalyptic number.

It is an amenable number.

561770728 is a deficient number, since it is larger than the sum of its proper divisors (497067032).

561770728 is a wasteful number, since it uses less digits than its factorization.

561770728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367848 (or 367844 counting only the distinct ones).

The product of its (nonzero) digits is 164640, while the sum is 43.

The square root of 561770728 is about 23701.7030611726. The cubic root of 561770728 is about 825.1249167445.

The spelling of 561770728 in words is "five hundred sixty-one million, seven hundred seventy thousand, seven hundred twenty-eight".