28263984 has 120 divisors (see below), whose sum is σ = 86766768. Its totient is φ = 7902720.

The previous prime is 28263931. The next prime is 28264007. The reversal of 28263984 is 48936282.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 143374 + ... + 143570.

Almost surely, 2^28263984 is an apocalyptic number.

28263984 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28263984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43383384).

28263984 is an abundant number, since it is smaller than the sum of its proper divisors (58502784).

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

28263984 is a wasteful number, since it uses less digits than its factorization.

28263984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283 (or 270 counting only the distinct ones).

The product of its digits is 165888, while the sum is 42.

The square root of 28263984 is about 5316.3882476734. The cubic root of 28263984 is about 304.6102124494.

The spelling of 28263984 in words is "twenty-eight million, two hundred sixty-three thousand, nine hundred eighty-four".