28682421 has 8 divisors (see below), whose sum is σ = 39562080. Its totient is φ = 18462192.

The previous prime is 28682413. The next prime is 28682431. The reversal of 28682421 is 12428682.

It is a happy number.

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

It is not a de Polignac number, because 28682421 - 2³ = 28682413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28682431) 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, 164755 + ... + 164928.

It is an arithmetic number, because the mean of its divisors is an integer number (4945260).

Almost surely, 2^28682421 is an apocalyptic number.

It is an amenable number.

28682421 is a deficient number, since it is larger than the sum of its proper divisors (10879659).

28682421 is a wasteful number, since it uses less digits than its factorization.

28682421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329715.

The product of its digits is 12288, while the sum is 33.

The square root of 28682421 is about 5355.5971655829. The cubic root of 28682421 is about 306.1060655851.

The spelling of 28682421 in words is "twenty-eight million, six hundred eighty-two thousand, four hundred twenty-one".