28426744621 has 4 divisors (see below), whose sum is σ = 31010994144. Its totient is φ = 25842495100.

The previous prime is 28426744609. The next prime is 28426744651. The reversal of 28426744621 is 12644762482.

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 28426744621 - 2¹¹ = 28426742573 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 (28426744601) 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, 1292124745 + ... + 1292124766.

It is an arithmetic number, because the mean of its divisors is an integer number (7752748536).

Almost surely, 2^28426744621 is an apocalyptic number.

It is an amenable number.

28426744621 is a deficient number, since it is larger than the sum of its proper divisors (2584249523).

28426744621 is a wasteful number, since it uses less digits than its factorization.

28426744621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2584249522.

The product of its digits is 1032192, while the sum is 46.

The spelling of 28426744621 in words is "twenty-eight billion, four hundred twenty-six million, seven hundred forty-four thousand, six hundred twenty-one".