28867428 has 72 divisors (see below), whose sum is σ = 80170272. Its totient is φ = 9051264.

The previous prime is 28867379. The next prime is 28867429. The reversal of 28867428 is 82476882.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28867429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15651 + ... + 17397.

It is an arithmetic number, because the mean of its divisors is an integer number (1113476).

Almost surely, 2^28867428 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 28867428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40085136).

28867428 is an abundant number, since it is smaller than the sum of its proper divisors (51302844).

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

28867428 is a wasteful number, since it uses less digits than its factorization.

28867428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1783 (or 1769 counting only the distinct ones).

The product of its digits is 344064, while the sum is 45.

The square root of 28867428 is about 5372.8417062110. The cubic root of 28867428 is about 306.7628027727.

The spelling of 28867428 in words is "twenty-eight million, eight hundred sixty-seven thousand, four hundred twenty-eight".