28051423 has 4 divisors (see below), whose sum is σ = 28265688. Its totient is φ = 27837160.

The previous prime is 28051409. The next prime is 28051489. The reversal of 28051423 is 32415082.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28051423 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 (28051403) 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, 106936 + ... + 107197.

It is an arithmetic number, because the mean of its divisors is an integer number (7066422).

Almost surely, 2^28051423 is an apocalyptic number.

28051423 is a deficient number, since it is larger than the sum of its proper divisors (214265).

28051423 is a wasteful number, since it uses less digits than its factorization.

28051423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214264.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 28051423 is about 5296.3594100099. The cubic root of 28051423 is about 303.8446769734.

The spelling of 28051423 in words is "twenty-eight million, fifty-one thousand, four hundred twenty-three".