1220501428 has 12 divisors (see below), whose sum is σ = 2136214080. Its totient is φ = 610154552.

The previous prime is 1220501389. The next prime is 1220501479. The reversal of 1220501428 is 8241050221.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9813 + ... + 50371.

It is an arithmetic number, because the mean of its divisors is an integer number (178017840).

Almost surely, 2^1220501428 is an apocalyptic number.

It is an amenable number.

1220501428 is a deficient number, since it is larger than the sum of its proper divisors (915712652).

1220501428 is a wasteful number, since it uses less digits than its factorization.

1220501428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48086 (or 48084 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 1220501428 is about 34935.6755766938. The cubic root of 1220501428 is about 1068.6761010062.

Adding to 1220501428 its reverse (8241050221), we get a palindrome (9461551649).

The spelling of 1220501428 in words is "one billion, two hundred twenty million, five hundred one thousand, four hundred twenty-eight".