15228828 has 54 divisors (see below), whose sum is σ = 39947544. Its totient is φ = 4891488.

The previous prime is 15228827. The next prime is 15228869. The reversal of 15228828 is 82882251.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 15228792 and 15228801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15228827) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 30025 + ... + 30527.

Almost surely, 2^15228828 is an apocalyptic number.

15228828 is a gapful number since it is divisible by the number (18) 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 15228828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19973772).

15228828 is an abundant number, since it is smaller than the sum of its proper divisors (24718716).

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

15228828 is a wasteful number, since it uses less digits than its factorization.

15228828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571 (or 537 counting only the distinct ones).

The product of its digits is 20480, while the sum is 36.

The square root of 15228828 is about 3902.4130996090. The cubic root of 15228828 is about 247.8689691101.

The spelling of 15228828 in words is "fifteen million, two hundred twenty-eight thousand, eight hundred twenty-eight".