28565506 has 4 divisors (see below), whose sum is σ = 42848262. Its totient is φ = 14282752.

The previous prime is 28565503. The next prime is 28565513. The reversal of 28565506 is 60556582.

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., 23435281 + 5130225 = 4841^2 + 2265^2 .

It is not an unprimeable number, because it can be changed into a prime (28565503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7141375 + ... + 7141378.

Almost surely, 2^28565506 is an apocalyptic number.

28565506 is a deficient number, since it is larger than the sum of its proper divisors (14282756).

28565506 is a wasteful number, since it uses less digits than its factorization.

28565506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14282755.

The product of its (nonzero) digits is 72000, while the sum is 37.

The square root of 28565506 is about 5344.6708037072. The cubic root of 28565506 is about 305.6895836822.

The spelling of 28565506 in words is "twenty-eight million, five hundred sixty-five thousand, five hundred six".