28872506 has 16 divisors (see below), whose sum is σ = 47902344. Its totient is φ = 12965184.

The previous prime is 28872499. The next prime is 28872539. The reversal of 28872506 is 60527882.

It can be written as a sum of positive squares in 4 ways, for example, as 15484225 + 13388281 = 3935^2 + 3659^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28872506.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14045 + ... + 15968.

Almost surely, 2^28872506 is an apocalyptic number.

28872506 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28872506 is a deficient number, since it is larger than the sum of its proper divisors (19029838).

28872506 is a wasteful number, since it uses less digits than its factorization.

28872506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30065.

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 28872506 is about 5373.3142472779. The cubic root of 28872506 is about 306.7807890209.

The spelling of 28872506 in words is "twenty-eight million, eight hundred seventy-two thousand, five hundred six".