28303332 has 48 divisors (see below), whose sum is σ = 67634112. Its totient is φ = 9210240.

The previous prime is 28303313. The next prime is 28303337. The reversal of 28303332 is 23330382.

It is not an unprimeable number, because it can be changed into a prime (28303337) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156282 + ... + 156462.

It is an arithmetic number, because the mean of its divisors is an integer number (1409044).

Almost surely, 2^28303332 is an apocalyptic number.

28303332 is the 4344-th pentagonal number.

It is an amenable number.

28303332 is an abundant number, since it is smaller than the sum of its proper divisors (39330780).

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

28303332 is a wasteful number, since it uses less digits than its factorization.

28303332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428 (or 426 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 24.

The square root of 28303332 is about 5320.0875932639. The cubic root of 28303332 is about 304.7515023313.

The spelling of 28303332 in words is "twenty-eight million, three hundred three thousand, three hundred thirty-two".