28529621 has 8 divisors (see below), whose sum is σ = 31798080. Its totient is φ = 25437888.

The previous prime is 28529617. The next prime is 28529623. The reversal of 28529621 is 12692582.

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 28529621 - 2² = 28529617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28529623) 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, 43841 + ... + 44486.

It is an arithmetic number, because the mean of its divisors is an integer number (3974760).

Almost surely, 2^28529621 is an apocalyptic number.

It is an amenable number.

28529621 is a deficient number, since it is larger than the sum of its proper divisors (3268459).

28529621 is a wasteful number, since it uses less digits than its factorization.

28529621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88363.

The product of its digits is 17280, while the sum is 35.

The square root of 28529621 is about 5341.3126663771. The cubic root of 28529621 is about 305.5615240169.

The spelling of 28529621 in words is "twenty-eight million, five hundred twenty-nine thousand, six hundred twenty-one".