28524021 has 8 divisors (see below), whose sum is σ = 38071200. Its totient is φ = 18996432.

The previous prime is 28524019. The next prime is 28524031. The reversal of 28524021 is 12042582.

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

It is not a de Polignac number, because 28524021 - 2¹ = 28524019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28523982 and 28524000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28524031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1071 + ... + 7628.

It is an arithmetic number, because the mean of its divisors is an integer number (4758900).

Almost surely, 2^28524021 is an apocalyptic number.

It is an amenable number.

28524021 is a deficient number, since it is larger than the sum of its proper divisors (9547179).

28524021 is a wasteful number, since it uses less digits than its factorization.

28524021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9795.

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 28524021 is about 5340.7884249425. The cubic root of 28524021 is about 305.5415301012.

The spelling of 28524021 in words is "twenty-eight million, five hundred twenty-four thousand, twenty-one".