1961985228 has 48 divisors (see below), whose sum is σ = 5234127360. Its totient is φ = 560335104.

The previous prime is 1961985203. The next prime is 1961985229. The reversal of 1961985228 is 8225891691.

It is not an unprimeable number, because it can be changed into a prime (1961985229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 389188 + ... + 394196.

It is an arithmetic number, because the mean of its divisors is an integer number (109044320).

Almost surely, 2^1961985228 is an apocalyptic number.

It is an amenable number.

1961985228 is an abundant number, since it is smaller than the sum of its proper divisors (3272142132).

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

1961985228 is a wasteful number, since it uses less digits than its factorization.

1961985228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9686 (or 9684 counting only the distinct ones).

The product of its digits is 622080, while the sum is 51.

The square root of 1961985228 is about 44294.3024327057. The cubic root of 1961985228 is about 1251.8873309247.

The spelling of 1961985228 in words is "one billion, nine hundred sixty-one million, nine hundred eighty-five thousand, two hundred twenty-eight".