1220198928 has 120 divisors (see below), whose sum is σ = 3431030400. Its totient is φ = 373501440.

The previous prime is 1220198927. The next prime is 1220198933. The reversal of 1220198928 is 8298910221.

It is a self number, because there is not a number n which added to its sum of digits gives 1220198928.

It is not an unprimeable number, because it can be changed into a prime (1220198923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2830873 + ... + 2831303.

It is an arithmetic number, because the mean of its divisors is an integer number (28591920).

Almost surely, 2^1220198928 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 1220198928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1715515200).

1220198928 is an abundant number, since it is smaller than the sum of its proper divisors (2210831472).

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

1220198928 is a wasteful number, since it uses less digits than its factorization.

1220198928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817 (or 798 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 42.

The square root of 1220198928 is about 34931.3459231104. The cubic root of 1220198928 is about 1068.5878036271.

The spelling of 1220198928 in words is "one billion, two hundred twenty million, one hundred ninety-eight thousand, nine hundred twenty-eight".