28557312 has 120 divisors (see below), whose sum is σ = 88077696. Its totient is φ = 8060928.

The previous prime is 28557311. The next prime is 28557313. The reversal of 28557312 is 21375582.

It is an interprime number because it is at equal distance from previous prime (28557311) and next prime (28557313).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28557311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 344023 + ... + 344105.

Almost surely, 2^28557312 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 28557312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44038848).

28557312 is an abundant number, since it is smaller than the sum of its proper divisors (59520384).

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

28557312 is an frugal number, since it uses more digits than its factorization.

28557312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121 (or 95 counting only the distinct ones).

The product of its digits is 16800, while the sum is 33.

The square root of 28557312 is about 5343.9041907579. The cubic root of 28557312 is about 305.6603519229.

The spelling of 28557312 in words is "twenty-eight million, five hundred fifty-seven thousand, three hundred twelve".