28506906 has 24 divisors (see below), whose sum is σ = 61866324. Its totient is φ = 9486720.

The previous prime is 28506889. The next prime is 28506911. The reversal of 28506906 is 60960582.

It can be written as a sum of positive squares in 2 ways, for example, as 24059025 + 4447881 = 4905^2 + 2109^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16776 + ... + 18396.

Almost surely, 2^28506906 is an apocalyptic number.

28506906 is an abundant number, since it is smaller than the sum of its proper divisors (33359418).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28506906 is a wasteful number, since it uses less digits than its factorization.

28506906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2606 (or 2603 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 28506906 is about 5339.1858929990. The cubic root of 28506906 is about 305.4804074713.

The spelling of 28506906 in words is "twenty-eight million, five hundred six thousand, nine hundred six".