1564768856 has 64 divisors (see below), whose sum is σ = 3415841280. Its totient is φ = 658183680.

The previous prime is 1564768841. The next prime is 1564768901. The reversal of 1564768856 is 6588674651.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a congruent number.

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, 675941 + ... + 678251.

It is an arithmetic number, because the mean of its divisors is an integer number (53372520).

Almost surely, 2^1564768856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1564768856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1707920640).

1564768856 is an abundant number, since it is smaller than the sum of its proper divisors (1851072424).

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

1564768856 is a wasteful number, since it uses less digits than its factorization.

1564768856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2544 (or 2540 counting only the distinct ones).

The product of its digits is 9676800, while the sum is 56.

The square root of 1564768856 is about 39557.1593520061. The cubic root of 1564768856 is about 1160.9585952562.

The spelling of 1564768856 in words is "one billion, five hundred sixty-four million, seven hundred sixty-eight thousand, eight hundred fifty-six".