28889328 has 80 divisors (see below), whose sum is σ = 81689216. Its totient is φ = 8743680.

The previous prime is 28889317. The next prime is 28889339. The reversal of 28889328 is 82398882.

It is an interprime number because it is at equal distance from previous prime (28889317) and next prime (28889339).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41463 + ... + 42153.

Almost surely, 2^28889328 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 28889328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40844608).

28889328 is an abundant number, since it is smaller than the sum of its proper divisors (52799888).

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

28889328 is a wasteful number, since it uses less digits than its factorization.

28889328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782 (or 776 counting only the distinct ones).

The product of its digits is 442368, while the sum is 48.

The square root of 28889328 is about 5374.8793474831. The cubic root of 28889328 is about 306.8403573926.

The spelling of 28889328 in words is "twenty-eight million, eight hundred eighty-nine thousand, three hundred twenty-eight".