28820823 has 12 divisors (see below), whose sum is σ = 39271800. Its totient is φ = 18800752.

The previous prime is 28820819. The next prime is 28820833. The reversal of 28820823 is 32802882.

It is not a de Polignac number, because 28820823 - 2² = 28820819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28820833) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4453 + ... + 8801.

It is an arithmetic number, because the mean of its divisors is an integer number (3272650).

Almost surely, 2^28820823 is an apocalyptic number.

28820823 is a deficient number, since it is larger than the sum of its proper divisors (10450977).

28820823 is an equidigital number, since it uses as much as digits as its factorization.

28820823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4446 (or 4399 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 28820823 is about 5368.5028639277. The cubic root of 28820823 is about 306.5976295183.

The spelling of 28820823 in words is "twenty-eight million, eight hundred twenty thousand, eight hundred twenty-three".