28528306 has 4 divisors (see below), whose sum is σ = 42792462. Its totient is φ = 14264152.

The previous prime is 28528301. The next prime is 28528309. The reversal of 28528306 is 60382582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 28526281 + 2025 = 5341^2 + 45^2 .

It is not an unprimeable number, because it can be changed into a prime (28528301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7132075 + ... + 7132078.

Almost surely, 2^28528306 is an apocalyptic number.

28528306 is a deficient number, since it is larger than the sum of its proper divisors (14264156).

28528306 is a wasteful number, since it uses less digits than its factorization.

28528306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14264155.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 28528306 is about 5341.1895678772. The cubic root of 28528306 is about 305.5568292521.

The spelling of 28528306 in words is "twenty-eight million, five hundred twenty-eight thousand, three hundred six".