28538066 has 4 divisors (see below), whose sum is σ = 42807102. Its totient is φ = 14269032.

The previous prime is 28538033. The next prime is 28538093. The reversal of 28538066 is 66083582.

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., 27931225 + 606841 = 5285^2 + 779^2 .

It is a super-2 number, since 2×28538066² = 1628842422040712, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7134515 + ... + 7134518.

Almost surely, 2^28538066 is an apocalyptic number.

28538066 is a deficient number, since it is larger than the sum of its proper divisors (14269036).

28538066 is a wasteful number, since it uses less digits than its factorization.

28538066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14269035.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 28538066 is about 5342.1031438938. The cubic root of 28538066 is about 305.5916706085.

The spelling of 28538066 in words is "twenty-eight million, five hundred thirty-eight thousand, sixty-six".