28024864 has 72 divisors (see below), whose sum is σ = 65456748. Its totient is φ = 11773440.

The previous prime is 28024861. The next prime is 28024883. The reversal of 28024864 is 46842082.

It can be written as a sum of positive squares in 2 ways, for example, as 28005264 + 19600 = 5292^2 + 140^2 .

It is not an unprimeable number, because it can be changed into a prime (28024861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 95502 + ... + 95794.

Almost surely, 2^28024864 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 28024864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32728374).

28024864 is an abundant number, since it is smaller than the sum of its proper divisors (37431884).

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

28024864 is a wasteful number, since it uses less digits than its factorization.

28024864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378 (or 363 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 34.

The square root of 28024864 is about 5293.8515279520. The cubic root of 28024864 is about 303.7487536289.

The spelling of 28024864 in words is "twenty-eight million, twenty-four thousand, eight hundred sixty-four".