28156823 has 2 divisors, whose sum is σ = 28156824. Its totient is φ = 28156822.

The previous prime is 28156781. The next prime is 28156847. The reversal of 28156823 is 32865182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28156823 - 2⁸ = 28156567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28156123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14078411 + 14078412.

It is an arithmetic number, because the mean of its divisors is an integer number (14078412).

Almost surely, 2^28156823 is an apocalyptic number.

28156823 is a deficient number, since it is larger than the sum of its proper divisors (1).

28156823 is an equidigital number, since it uses as much as digits as its factorization.

28156823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 35.

The square root of 28156823 is about 5306.3003118934. The cubic root of 28156823 is about 304.2247551617.

The spelling of 28156823 in words is "twenty-eight million, one hundred fifty-six thousand, eight hundred twenty-three".