28401920383 has 4 divisors (see below), whose sum is σ = 30072621600. Its totient is φ = 26731219168.

The previous prime is 28401920359. The next prime is 28401920399. The reversal of 28401920383 is 38302910482.

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

It is a cyclic number.

It is not a de Polignac number, because 28401920383 - 2¹³ = 28401912191 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 (28401920083) 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, 835350583 + ... + 835350616.

It is an arithmetic number, because the mean of its divisors is an integer number (7518155400).

Almost surely, 2^28401920383 is an apocalyptic number.

28401920383 is a deficient number, since it is larger than the sum of its proper divisors (1670701217).

28401920383 is a wasteful number, since it uses less digits than its factorization.

28401920383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1670701216.

The product of its (nonzero) digits is 82944, while the sum is 40.

Subtracting 28401920383 from its reverse (38302910482), we obtain a palindrome (9900990099).

The spelling of 28401920383 in words is "twenty-eight billion, four hundred one million, nine hundred twenty thousand, three hundred eighty-three".