28021433 has 8 divisors (see below), whose sum is σ = 30716256. Its totient is φ = 25351200.

The previous prime is 28021421. The next prime is 28021501. The reversal of 28021433 is 33412082.

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 28021433 - 2⁶ = 28021369 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28021399 and 28021408.

It is not an unprimeable number, because it can be changed into a prime (28021403) 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, 3716 + ... + 8357.

It is an arithmetic number, because the mean of its divisors is an integer number (3839532).

Almost surely, 2^28021433 is an apocalyptic number.

It is an amenable number.

28021433 is a deficient number, since it is larger than the sum of its proper divisors (2694823).

28021433 is a wasteful number, since it uses less digits than its factorization.

28021433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12295.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 28021433 is about 5293.5274628550. The cubic root of 28021433 is about 303.7363574402.

The spelling of 28021433 in words is "twenty-eight million, twenty-one thousand, four hundred thirty-three".