2128923636 has 96 divisors (see below), whose sum is σ = 5996863488. Its totient is φ = 574922880.

The previous prime is 2128923613. The next prime is 2128923653. The reversal of 2128923636 is 6363298212.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102466 + ... + 121478.

It is an arithmetic number, because the mean of its divisors is an integer number (62467328).

Almost surely, 2^2128923636 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 2128923636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2998431744).

2128923636 is an abundant number, since it is smaller than the sum of its proper divisors (3867939852).

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

2128923636 is a wasteful number, since it uses less digits than its factorization.

2128923636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19101 (or 19099 counting only the distinct ones).

The product of its digits is 186624, while the sum is 42.

The square root of 2128923636 is about 46140.2604674053. The cubic root of 2128923636 is about 1286.4315851343.

The spelling of 2128923636 in words is "two billion, one hundred twenty-eight million, nine hundred twenty-three thousand, six hundred thirty-six".