28997332 has 96 divisors (see below), whose sum is σ = 67173120. Its totient is φ = 10644480.

The previous prime is 28997327. The next prime is 28997333. The reversal of 28997332 is 23379982.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28997333) 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, 432763 + ... + 432829.

It is an arithmetic number, because the mean of its divisors is an integer number (699720).

Almost surely, 2^28997332 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 28997332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33586560).

28997332 is an abundant number, since it is smaller than the sum of its proper divisors (38175788).

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

28997332 is a wasteful number, since it uses less digits than its factorization.

28997332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 159 counting only the distinct ones).

The product of its digits is 163296, while the sum is 43.

The square root of 28997332 is about 5384.9170838556. The cubic root of 28997332 is about 307.2222605080. Note that the first 4 decimals are identical.

The spelling of 28997332 in words is "twenty-eight million, nine hundred ninety-seven thousand, three hundred thirty-two".