28428828 has 96 divisors (see below), whose sum is σ = 75188736. Its totient is φ = 8312832.

The previous prime is 28428793. The next prime is 28428847. The reversal of 28428828 is 82882482.

It is a super-2 number, since 2×28428828² = 1616396522907168, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28428828.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 342475 + ... + 342557.

It is an arithmetic number, because the mean of its divisors is an integer number (783216).

Almost surely, 2^28428828 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 28428828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37594368).

28428828 is an abundant number, since it is smaller than the sum of its proper divisors (46759908).

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

28428828 is a wasteful number, since it uses less digits than its factorization.

28428828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203 (or 201 counting only the distinct ones).

The product of its digits is 131072, while the sum is 42.

The square root of 28428828 is about 5331.8690906660. The cubic root of 28428828 is about 305.2012574762.

The spelling of 28428828 in words is "twenty-eight million, four hundred twenty-eight thousand, eight hundred twenty-eight".