1220158772 has 24 divisors (see below), whose sum is σ = 2451273216. Its totient is φ = 520577568.

The previous prime is 1220158769. The next prime is 1220158787. The reversal of 1220158772 is 2778510221.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91463 + ... + 103950.

It is an arithmetic number, because the mean of its divisors is an integer number (102136384).

Almost surely, 2^1220158772 is an apocalyptic number.

It is an amenable number.

1220158772 is an abundant number, since it is smaller than the sum of its proper divisors (1231114444).

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

1220158772 is a wasteful number, since it uses less digits than its factorization.

1220158772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195647 (or 195645 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 35.

The square root of 1220158772 is about 34930.7711337726. The cubic root of 1220158772 is about 1068.5760813082.

Adding to 1220158772 its reverse (2778510221), we get a palindrome (3998668993).

The spelling of 1220158772 in words is "one billion, two hundred twenty million, one hundred fifty-eight thousand, seven hundred seventy-two".