28011984 has 240 divisors, whose sum is σ = 99743616. Its totient is φ = 6589440.

The previous prime is 28011943. The next prime is 28011989. The reversal of 28011984 is 48911082.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28011989) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 528502 + ... + 528554.

Almost surely, 2^28011984 is an apocalyptic number.

28011984 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 28011984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49871808).

28011984 is an abundant number, since it is smaller than the sum of its proper divisors (71731632).

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

28011984 is a wasteful number, since it uses less digits than its factorization.

28011984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 28011984 is about 5292.6348825514. The cubic root of 28011984 is about 303.7022130111.

28011984 divided by its sum of digits (33) gives a palindrome (848848).

The spelling of 28011984 in words is "twenty-eight million, eleven thousand, nine hundred eighty-four".