28897332 has 24 divisors (see below), whose sum is σ = 69603072. Its totient is φ = 9321600.

The previous prime is 28897313. The next prime is 28897343. The reversal of 28897332 is 23379882.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38469 + ... + 39212.

It is an arithmetic number, because the mean of its divisors is an integer number (2900128).

Almost surely, 2^28897332 is an apocalyptic number.

It is an amenable number.

28897332 is an abundant number, since it is smaller than the sum of its proper divisors (40705740).

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

28897332 is a wasteful number, since it uses less digits than its factorization.

28897332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77719 (or 77717 counting only the distinct ones).

The product of its digits is 145152, while the sum is 42.

The square root of 28897332 is about 5375.6238707707. The cubic root of 28897332 is about 306.8686922324.

The spelling of 28897332 in words is "twenty-eight million, eight hundred ninety-seven thousand, three hundred thirty-two".