1891536828 has 12 divisors (see below), whose sum is σ = 4413585960. Its totient is φ = 630512272.

The previous prime is 1891536821. The next prime is 1891536877. The reversal of 1891536828 is 8286351981.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1891536821) by changing a digit.

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, 78814023 + ... + 78814046.

It is an arithmetic number, because the mean of its divisors is an integer number (367798830).

Almost surely, 2^1891536828 is an apocalyptic number.

It is an amenable number.

1891536828 is an abundant number, since it is smaller than the sum of its proper divisors (2522049132).

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

1891536828 is a wasteful number, since it uses less digits than its factorization.

1891536828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157628076 (or 157628074 counting only the distinct ones).

The product of its digits is 829440, while the sum is 51.

The square root of 1891536828 is about 43491.8018481644. The cubic root of 1891536828 is about 1236.7206159054.

The spelling of 1891536828 in words is "one billion, eight hundred ninety-one million, five hundred thirty-six thousand, eight hundred twenty-eight".