28819648 has 112 divisors (see below), whose sum is σ = 69640704. Its totient is φ = 11658240.

The previous prime is 28819639. The next prime is 28819657. The reversal of 28819648 is 84691882.

It is an interprime number because it is at equal distance from previous prime (28819639) and next prime (28819657).

It is a super-2 number, since 2×28819648² = 1661144221687808, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28819598 and 28819607.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 430111 + ... + 430177.

It is an arithmetic number, because the mean of its divisors is an integer number (621792).

Almost surely, 2^28819648 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 28819648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34820352).

28819648 is an abundant number, since it is smaller than the sum of its proper divisors (40821056).

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

28819648 is a wasteful number, since it uses less digits than its factorization.

28819648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150 (or 140 counting only the distinct ones).

The product of its digits is 221184, while the sum is 46.

The square root of 28819648 is about 5368.3934282055. The cubic root of 28819648 is about 306.5934628883.

The spelling of 28819648 in words is "twenty-eight million, eight hundred nineteen thousand, six hundred forty-eight".