28010506 has 4 divisors (see below), whose sum is σ = 42015762. Its totient is φ = 14005252.

The previous prime is 28010497. The next prime is 28010531. The reversal of 28010506 is 60501082.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60501082 = 2 ⋅30250541.

It can be written as a sum of positive squares in only one way, i.e., 26780625 + 1229881 = 5175^2 + 1109^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7002625 + ... + 7002628.

Almost surely, 2^28010506 is an apocalyptic number.

28010506 is a deficient number, since it is larger than the sum of its proper divisors (14005256).

28010506 is a wasteful number, since it uses less digits than its factorization.

28010506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14005255.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 28010506 is about 5292.4952527140. The cubic root of 28010506 is about 303.6968714905.

Adding to 28010506 its reverse (60501082), we get a palindrome (88511588).

The spelling of 28010506 in words is "twenty-eight million, ten thousand, five hundred six".