9821428637 has 4 divisors (see below), whose sum is σ = 10160098620. Its totient is φ = 9482758656.

The previous prime is 9821428627. The next prime is 9821428679. The reversal of 9821428637 is 7368241289.

9821428637 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2313032836 + 7508395801 = 48094^2 + 86651^2 .

It is a cyclic number.

It is not a de Polignac number, because 9821428637 - 2⁴ = 9821428621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9821428607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169334948 + ... + 169335005.

It is an arithmetic number, because the mean of its divisors is an integer number (2540024655).

Almost surely, 2^9821428637 is an apocalyptic number.

It is an amenable number.

9821428637 is a deficient number, since it is larger than the sum of its proper divisors (338669983).

9821428637 is a wasteful number, since it uses less digits than its factorization.

9821428637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338669982.

The product of its digits is 1161216, while the sum is 50.

The square root of 9821428637 is about 99103.1212273357. The cubic root of 9821428637 is about 2141.5335789460.

The spelling of 9821428637 in words is "nine billion, eight hundred twenty-one million, four hundred twenty-eight thousand, six hundred thirty-seven".