28327521 has 8 divisors (see below), whose sum is σ = 38988544. Its totient is φ = 18275760.

The previous prime is 28327517. The next prime is 28327531. The reversal of 28327521 is 12572382.

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

It is not a de Polignac number, because 28327521 - 2² = 28327517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28327531) 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, 152206 + ... + 152391.

It is an arithmetic number, because the mean of its divisors is an integer number (4873568).

Almost surely, 2^28327521 is an apocalyptic number.

It is an amenable number.

28327521 is a deficient number, since it is larger than the sum of its proper divisors (10661023).

28327521 is a wasteful number, since it uses less digits than its factorization.

28327521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304631.

The product of its digits is 6720, while the sum is 30.

The square root of 28327521 is about 5322.3604725723. The cubic root of 28327521 is about 304.8382946457.

The spelling of 28327521 in words is "twenty-eight million, three hundred twenty-seven thousand, five hundred twenty-one".