28421788 has 12 divisors (see below), whose sum is σ = 49805280. Its totient is φ = 14191712.

The previous prime is 28421779. The next prime is 28421801. The reversal of 28421788 is 88712482.

It is a super-3 number, since 3×28421788³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28421788.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1156 + ... + 7627.

It is an arithmetic number, because the mean of its divisors is an integer number (4150440).

Almost surely, 2^28421788 is an apocalyptic number.

It is an amenable number.

28421788 is a deficient number, since it is larger than the sum of its proper divisors (21383492).

28421788 is a wasteful number, since it uses less digits than its factorization.

28421788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9596 (or 9594 counting only the distinct ones).

The product of its digits is 57344, while the sum is 40.

The square root of 28421788 is about 5331.2088685400. The cubic root of 28421788 is about 305.1760624613.

The spelling of 28421788 in words is "twenty-eight million, four hundred twenty-one thousand, seven hundred eighty-eight".