28819320 has 64 divisors (see below), whose sum is σ = 87138720. Its totient is φ = 7624704.

The previous prime is 28819291. The next prime is 28819381. The reversal of 28819320 is 2391882.

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, 15564 + ... + 17316.

Almost surely, 2^28819320 is an apocalyptic number.

28819320 is a gapful number since it is divisible by the number (20) 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 28819320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43569360).

28819320 is an abundant number, since it is smaller than the sum of its proper divisors (58319400).

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

28819320 is a wasteful number, since it uses less digits than its factorization.

28819320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1904 (or 1900 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 28819320 is about 5368.3628789418. The cubic root of 28819320 is about 306.5922997578.

The spelling of 28819320 in words is "twenty-eight million, eight hundred nineteen thousand, three hundred twenty".