28203332 has 12 divisors (see below), whose sum is σ = 49865340. Its totient is φ = 13956096.

The previous prime is 28203319. The next prime is 28203349. The reversal of 28203332 is 23330282.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6895876 + 21307456 = 2626^2 + 4616^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28203298 and 28203307.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35957 + ... + 36732.

It is an arithmetic number, because the mean of its divisors is an integer number (4155445).

Almost surely, 2^28203332 is an apocalyptic number.

It is an amenable number.

28203332 is a deficient number, since it is larger than the sum of its proper divisors (21662008).

28203332 is a wasteful number, since it uses less digits than its factorization.

28203332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72790 (or 72788 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 28203332 is about 5310.6809356240. The cubic root of 28203332 is about 304.3921675838.

The spelling of 28203332 in words is "twenty-eight million, two hundred three thousand, three hundred thirty-two".