28081123 has 8 divisors (see below), whose sum is σ = 32198400. Its totient is φ = 23990280.

The previous prime is 28081117. The next prime is 28081153. The reversal of 28081123 is 32118082.

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 28081123 - 2¹⁷ = 27950051 is a prime.

It is a super-2 number, since 2×28081123² = 1577098937882258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28081153) 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, 4273 + ... + 8626.

It is an arithmetic number, because the mean of its divisors is an integer number (4024800).

Almost surely, 2^28081123 is an apocalyptic number.

28081123 is a deficient number, since it is larger than the sum of its proper divisors (4117277).

28081123 is a wasteful number, since it uses less digits than its factorization.

28081123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13217.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 28081123 is about 5299.1624809964. The cubic root of 28081123 is about 303.9518730080.

The spelling of 28081123 in words is "twenty-eight million, eighty-one thousand, one hundred twenty-three".