28697328 has 180 divisors, whose sum is σ = 93047864. Its totient is φ = 8553600.

The previous prime is 28697321. The next prime is 28697341. The reversal of 28697328 is 82379682.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28697321) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 470418 + ... + 470478.

Almost surely, 2^28697328 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28697328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46523932).

28697328 is an abundant number, since it is smaller than the sum of its proper divisors (64350536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28697328 is a wasteful number, since it uses less digits than its factorization.

28697328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106 (or 77 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 28697328 is about 5356.9887063536. The cubic root of 28697328 is about 306.1590868279.

The spelling of 28697328 in words is "twenty-eight million, six hundred ninety-seven thousand, three hundred twenty-eight".