28197312 has 168 divisors, whose sum is σ = 89245440. Its totient is φ = 7787520.

The previous prime is 28197289. The next prime is 28197343. The reversal of 28197312 is 21379182.

It is a Harshad number since it is a multiple of its sum of digits (33).

Its product of digits (6048) is a multiple of the sum of its prime divisors (108).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 356889 + ... + 356967.

Almost surely, 2^28197312 is an apocalyptic number.

28197312 is a gapful number since it is divisible by the number (22) 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 28197312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44622720).

28197312 is an abundant number, since it is smaller than the sum of its proper divisors (61048128).

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

28197312 is a wasteful number, since it uses less digits than its factorization.

28197312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131 (or 108 counting only the distinct ones).

The product of its digits is 6048, while the sum is 33.

The square root of 28197312 is about 5310.1141230674. The cubic root of 28197312 is about 304.3705085443.

The spelling of 28197312 in words is "twenty-eight million, one hundred ninety-seven thousand, three hundred twelve".