28030428 has 96 divisors (see below), whose sum is σ = 76204800. Its totient is φ = 8903232.

The previous prime is 28030427. The next prime is 28030439. The reversal of 28030428 is 82403082.

It is a super-3 number, since 3×28030428³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28030421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 337675 + ... + 337757.

It is an arithmetic number, because the mean of its divisors is an integer number (793800).

Almost surely, 2^28030428 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 28030428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38102400).

28030428 is an abundant number, since it is smaller than the sum of its proper divisors (48174372).

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

28030428 is a wasteful number, since it uses less digits than its factorization.

28030428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208 (or 200 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 28030428 is about 5294.3770171759. The cubic root of 28030428 is about 303.7688541871.

The spelling of 28030428 in words is "twenty-eight million, thirty thousand, four hundred twenty-eight".