28107848021 has 4 divisors (see below), whose sum is σ = 30663106944. Its totient is φ = 25552589100.

The previous prime is 28107848017. The next prime is 28107848023. The reversal of 28107848021 is 12084870182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28107848021 - 2² = 28107848017 is a prime.

It is a super-2 number, since 2×28107848021² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28107848021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28107848023) 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, 1277629445 + ... + 1277629466.

It is an arithmetic number, because the mean of its divisors is an integer number (7665776736).

Almost surely, 2^28107848021 is an apocalyptic number.

It is an amenable number.

28107848021 is a deficient number, since it is larger than the sum of its proper divisors (2555258923).

28107848021 is a wasteful number, since it uses less digits than its factorization.

28107848021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2555258922.

The product of its (nonzero) digits is 57344, while the sum is 41.

The spelling of 28107848021 in words is "twenty-eight billion, one hundred seven million, eight hundred forty-eight thousand, twenty-one".