28207123 has 4 divisors (see below), whose sum is σ = 32236720. Its totient is φ = 24177528.

The previous prime is 28207103. The next prime is 28207141. The reversal of 28207123 is 32170282.

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 28207123 - 2⁹ = 28206611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28207103) 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, 2014788 + ... + 2014801.

It is an arithmetic number, because the mean of its divisors is an integer number (8059180).

Almost surely, 2^28207123 is an apocalyptic number.

28207123 is a deficient number, since it is larger than the sum of its proper divisors (4029597).

28207123 is an equidigital number, since it uses as much as digits as its factorization.

28207123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4029596.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 28207123 is about 5311.0378458452. The cubic root of 28207123 is about 304.4058054406.

The spelling of 28207123 in words is "twenty-eight million, two hundred seven thousand, one hundred twenty-three".