28978288 has 20 divisors (see below), whose sum is σ = 56824488. Its totient is φ = 14313920.

The previous prime is 28978283. The next prime is 28978307. The reversal of 28978288 is 88287982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28978283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9583 + ... + 12238.

Almost surely, 2^28978288 is an apocalyptic number.

It is an amenable number.

28978288 is a deficient number, since it is larger than the sum of its proper divisors (27846200).

28978288 is a wasteful number, since it uses less digits than its factorization.

28978288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21912 (or 21906 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 52.

The square root of 28978288 is about 5383.1485210795. The cubic root of 28978288 is about 307.1549896982.

The spelling of 28978288 in words is "twenty-eight million, nine hundred seventy-eight thousand, two hundred eighty-eight".