28924521 has 4 divisors (see below), whose sum is σ = 38566032. Its totient is φ = 19283012.

The previous prime is 28924499. The next prime is 28924529. The reversal of 28924521 is 12542982.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28924521 - 2¹⁰ = 28923497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28924529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4820751 + ... + 4820756.

It is an arithmetic number, because the mean of its divisors is an integer number (9641508).

Almost surely, 2^28924521 is an apocalyptic number.

It is an amenable number.

28924521 is a deficient number, since it is larger than the sum of its proper divisors (9641511).

28924521 is an equidigital number, since it uses as much as digits as its factorization.

28924521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9641510.

The product of its digits is 11520, while the sum is 33.

The square root of 28924521 is about 5378.1521919708. The cubic root of 28924521 is about 306.9649045460.

The spelling of 28924521 in words is "twenty-eight million, nine hundred twenty-four thousand, five hundred twenty-one".