1961382228 has 72 divisors (see below), whose sum is σ = 4979052288. Its totient is φ = 600657408.

The previous prime is 1961382161. The next prime is 1961382233. The reversal of 1961382228 is 8222831691.

It is a self number, because there is not a number n which added to its sum of digits gives 1961382228.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 450076 + ... + 454412.

It is an arithmetic number, because the mean of its divisors is an integer number (69153504).

Almost surely, 2^1961382228 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 1961382228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2489526144).

1961382228 is an abundant number, since it is smaller than the sum of its proper divisors (3017670060).

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

1961382228 is a wasteful number, since it uses less digits than its factorization.

1961382228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4593 (or 4578 counting only the distinct ones).

The product of its digits is 82944, while the sum is 42.

The square root of 1961382228 is about 44287.4951651140. The cubic root of 1961382228 is about 1251.7590653634.

The spelling of 1961382228 in words is "one billion, nine hundred sixty-one million, three hundred eighty-two thousand, two hundred twenty-eight".