28297997823 has 8 divisors (see below), whose sum is σ = 37922190768. Its totient is φ = 18769568384.

The previous prime is 28297997821. The next prime is 28297997851. The reversal of 28297997823 is 32879979282.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28297997823 - 2¹ = 28297997821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28297997821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23940186 + ... + 23941367.

It is an arithmetic number, because the mean of its divisors is an integer number (4740273846).

Almost surely, 2^28297997823 is an apocalyptic number.

28297997823 is a deficient number, since it is larger than the sum of its proper divisors (9624192945).

28297997823 is a wasteful number, since it uses less digits than its factorization.

28297997823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47881753.

The product of its digits is 54867456, while the sum is 66.

The spelling of 28297997823 in words is "twenty-eight billion, two hundred ninety-seven million, nine hundred ninety-seven thousand, eight hundred twenty-three".