28208355923 has 8 divisors (see below), whose sum is σ = 30774507120. Its totient is φ = 25642497280.

The previous prime is 28208355913. The next prime is 28208355961. The reversal of 28208355923 is 32955380282.

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 28208355923 - 2⁴ = 28208355907 is a prime.

It is a super-2 number, since 2×28208355923² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28208355913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161111 + ... + 287007.

It is an arithmetic number, because the mean of its divisors is an integer number (3846813390).

Almost surely, 2^28208355923 is an apocalyptic number.

28208355923 is a deficient number, since it is larger than the sum of its proper divisors (2566151197).

28208355923 is a wasteful number, since it uses less digits than its factorization.

28208355923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146277.

The product of its (nonzero) digits is 1036800, while the sum is 47.

The spelling of 28208355923 in words is "twenty-eight billion, two hundred eight million, three hundred fifty-five thousand, nine hundred twenty-three".