28886421 has 8 divisors (see below), whose sum is σ = 39057984. Its totient is φ = 18986240.

The previous prime is 28886419. The next prime is 28886437. The reversal of 28886421 is 12468882.

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 28886421 - 2¹ = 28886419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28886421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28886401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67596 + ... + 68021.

It is an arithmetic number, because the mean of its divisors is an integer number (4882248).

Almost surely, 2^28886421 is an apocalyptic number.

It is an amenable number.

28886421 is a deficient number, since it is larger than the sum of its proper divisors (10171563).

28886421 is a wasteful number, since it uses less digits than its factorization.

28886421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135691.

The product of its digits is 49152, while the sum is 39.

The square root of 28886421 is about 5374.6089160050. The cubic root of 28886421 is about 306.8300650701.

The spelling of 28886421 in words is "twenty-eight million, eight hundred eighty-six thousand, four hundred twenty-one".