28150823 has 4 divisors (see below), whose sum is σ = 28183800. Its totient is φ = 28117848.

The previous prime is 28150819. The next prime is 28150831. The reversal of 28150823 is 32805182.

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 28150823 - 2² = 28150819 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 (28150813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15173 + ... + 16926.

It is an arithmetic number, because the mean of its divisors is an integer number (7045950).

Almost surely, 2^28150823 is an apocalyptic number.

28150823 is a deficient number, since it is larger than the sum of its proper divisors (32977).

28150823 is an equidigital number, since it uses as much as digits as its factorization.

28150823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32976.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 28150823 is about 5305.7349161073. The cubic root of 28150823 is about 304.2031443168.

The spelling of 28150823 in words is "twenty-eight million, one hundred fifty thousand, eight hundred twenty-three".