1564728856 has 16 divisors (see below), whose sum is σ = 2939142240. Its totient is φ = 780957600.

The previous prime is 1564728839. The next prime is 1564728857. The reversal of 1564728856 is 6588274651.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1564728857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171120 + ... + 180031.

It is an arithmetic number, because the mean of its divisors is an integer number (183696390).

Almost surely, 2^1564728856 is an apocalyptic number.

It is an amenable number.

1564728856 is a deficient number, since it is larger than the sum of its proper divisors (1374413384).

1564728856 is a wasteful number, since it uses less digits than its factorization.

1564728856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351714 (or 351710 counting only the distinct ones).

The product of its digits is 3225600, while the sum is 52.

The square root of 1564728856 is about 39556.6537512970. The cubic root of 1564728856 is about 1160.9487026898.

The spelling of 1564728856 in words is "one billion, five hundred sixty-four million, seven hundred twenty-eight thousand, eight hundred fifty-six".