28821023 has 8 divisors (see below), whose sum is σ = 35932800. Its totient is φ = 22457880.

The previous prime is 28820993. The next prime is 28821049. The reversal of 28821023 is 32012882.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28821023 - 2⁸ = 28820767 is a prime.

It is a super-4 number, since 4×28821023⁴ (a number of 31 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28820983 and 28821001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28820023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187073 + ... + 187226.

It is an arithmetic number, because the mean of its divisors is an integer number (4491600).

Almost surely, 2^28821023 is an apocalyptic number.

28821023 is a deficient number, since it is larger than the sum of its proper divisors (7111777).

28821023 is a wasteful number, since it uses less digits than its factorization.

28821023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374317.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 28821023 is about 5368.5214910625. The cubic root of 28821023 is about 306.5983387206.

The spelling of 28821023 in words is "twenty-eight million, eight hundred twenty-one thousand, twenty-three".