1961905728 has 28 divisors (see below), whose sum is σ = 5190876080. Its totient is φ = 653968512.

The previous prime is 1961905721. The next prime is 1961905747. The reversal of 1961905728 is 8275091691.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (1961905721) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5108938 + ... + 5109321.

Almost surely, 2^1961905728 is an apocalyptic number.

It is an amenable number.

1961905728 is an abundant number, since it is smaller than the sum of its proper divisors (3228970352).

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

1961905728 is a wasteful number, since it uses less digits than its factorization.

1961905728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10218274 (or 10218264 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 48.

The square root of 1961905728 is about 44293.4050170000. The cubic root of 1961905728 is about 1251.8704217952.

The spelling of 1961905728 in words is "one billion, nine hundred sixty-one million, nine hundred five thousand, seven hundred twenty-eight".