28894821 has 8 divisors (see below), whose sum is σ = 39769344. Its totient is φ = 18641760.

The previous prime is 28894793. The next prime is 28894823. The reversal of 28894821 is 12849882.

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

It is not a de Polignac number, because 28894821 - 2¹⁰ = 28893797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28894823) 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, 155256 + ... + 155441.

It is an arithmetic number, because the mean of its divisors is an integer number (4971168).

Almost surely, 2^28894821 is an apocalyptic number.

It is an amenable number.

28894821 is a deficient number, since it is larger than the sum of its proper divisors (10874523).

28894821 is a wasteful number, since it uses less digits than its factorization.

28894821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310731.

The product of its digits is 73728, while the sum is 42.

The square root of 28894821 is about 5375.3903114100. The cubic root of 28894821 is about 306.8598036424.

The spelling of 28894821 in words is "twenty-eight million, eight hundred ninety-four thousand, eight hundred twenty-one".