28513828 has 48 divisors (see below), whose sum is σ = 62052480. Its totient is φ = 11183616.

The previous prime is 28513801. The next prime is 28513861. The reversal of 28513828 is 82831582.

It is a Harshad number since it is a multiple of its sum of digits (37).

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, 16803 + ... + 18421.

It is an arithmetic number, because the mean of its divisors is an integer number (1292760).

Almost surely, 2^28513828 is an apocalyptic number.

28513828 is a gapful number since it is divisible by the number (28) 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 28513828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31026240).

28513828 is an abundant number, since it is smaller than the sum of its proper divisors (33538652).

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

28513828 is a wasteful number, since it uses less digits than its factorization.

28513828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1684 (or 1682 counting only the distinct ones).

The product of its digits is 30720, while the sum is 37.

The square root of 28513828 is about 5339.8340798193. The cubic root of 28513828 is about 305.5051308869.

The spelling of 28513828 in words is "twenty-eight million, five hundred thirteen thousand, eight hundred twenty-eight".