1220912564 has 12 divisors (see below), whose sum is σ = 2249049600. Its totient is φ = 578326968.

The previous prime is 1220912551. The next prime is 1220912593. The reversal of 1220912564 is 4652190221.

It is a self number, because there is not a number n which added to its sum of digits gives 1220912564.

It is a congruent number.

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, 8032244 + ... + 8032395.

It is an arithmetic number, because the mean of its divisors is an integer number (187420800).

Almost surely, 2^1220912564 is an apocalyptic number.

It is an amenable number.

1220912564 is a deficient number, since it is larger than the sum of its proper divisors (1028137036).

1220912564 is a wasteful number, since it uses less digits than its factorization.

1220912564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16064662 (or 16064660 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 1220912564 is about 34941.5592668673. The cubic root of 1220912564 is about 1068.7960849957.

The spelling of 1220912564 in words is "one billion, two hundred twenty million, nine hundred twelve thousand, five hundred sixty-four".