28025506 has 4 divisors (see below), whose sum is σ = 42038262. Its totient is φ = 14012752.

The previous prime is 28025483. The next prime is 28025507. The reversal of 28025506 is 60552082.

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., 14402025 + 13623481 = 3795^2 + 3691^2 .

It is not an unprimeable number, because it can be changed into a prime (28025507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7006375 + ... + 7006378.

Almost surely, 2^28025506 is an apocalyptic number.

28025506 is a deficient number, since it is larger than the sum of its proper divisors (14012756).

28025506 is a wasteful number, since it uses less digits than its factorization.

28025506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14012755.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 28025506 is about 5293.9121639861. The cubic root of 28025506 is about 303.7510730598.

Adding to 28025506 its reverse (60552082), we get a palindrome (88577588).

The spelling of 28025506 in words is "twenty-eight million, twenty-five thousand, five hundred six".