1220136564 has 48 divisors (see below), whose sum is σ = 2958681600. Its totient is φ = 390933120.

The previous prime is 1220136551. The next prime is 1220136587. The reversal of 1220136564 is 4656310221.

1220136564 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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, 44422 + ... + 66434.

It is an arithmetic number, because the mean of its divisors is an integer number (61639200).

Almost surely, 2^1220136564 is an apocalyptic number.

It is an amenable number.

1220136564 is an abundant number, since it is smaller than the sum of its proper divisors (1738545036).

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

1220136564 is a wasteful number, since it uses less digits than its factorization.

1220136564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22200 (or 22198 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 1220136564 is about 34930.4532464152. The cubic root of 1220136564 is about 1068.5695982499.

Adding to 1220136564 its reverse (4656310221), we get a palindrome (5876446785).

The spelling of 1220136564 in words is "one billion, two hundred twenty million, one hundred thirty-six thousand, five hundred sixty-four".