28197152 has 36 divisors (see below), whose sum is σ = 58990050. Its totient is φ = 13264896.

The previous prime is 28197137. The next prime is 28197157. The reversal of 28197152 is 25179182.

It can be written as a sum of positive squares in 3 ways, for example, as 25361296 + 2835856 = 5036^2 + 1684^2 .

It is a super-2 number, since 2×28197152² = 1590158761822208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28197157) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7724 + ... + 10772.

Almost surely, 2^28197152 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 28197152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29495025).

28197152 is an abundant number, since it is smaller than the sum of its proper divisors (30792898).

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

28197152 is a wasteful number, since it uses less digits than its factorization.

28197152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3093 (or 3068 counting only the distinct ones).

The product of its digits is 10080, while the sum is 35.

The square root of 28197152 is about 5310.0990574565. The cubic root of 28197152 is about 304.3699328467.

The spelling of 28197152 in words is "twenty-eight million, one hundred ninety-seven thousand, one hundred fifty-two".