28953021 has 8 divisors (see below), whose sum is σ = 40282560. Its totient is φ = 18462752.

The previous prime is 28953013. The next prime is 28953037. The reversal of 28953021 is 12035982.

It is a happy number.

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 28953021 - 2³ = 28953013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28953021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28953521) 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, 209736 + ... + 209873.

It is an arithmetic number, because the mean of its divisors is an integer number (5035320).

Almost surely, 2^28953021 is an apocalyptic number.

It is an amenable number.

28953021 is a deficient number, since it is larger than the sum of its proper divisors (11329539).

28953021 is a wasteful number, since it uses less digits than its factorization.

28953021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419635.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 28953021 is about 5380.8011485280. The cubic root of 28953021 is about 307.0656913257.

The spelling of 28953021 in words is "twenty-eight million, nine hundred fifty-three thousand, twenty-one".