28506918 has 32 divisors (see below), whose sum is σ = 64207872. Its totient is φ = 8359200.

The previous prime is 28506917. The next prime is 28506923. The reversal of 28506918 is 81960582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28506911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4921 + ... + 9012.

It is an arithmetic number, because the mean of its divisors is an integer number (2006496).

Almost surely, 2^28506918 is an apocalyptic number.

28506918 is an abundant number, since it is smaller than the sum of its proper divisors (35700954).

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

28506918 is a wasteful number, since it uses less digits than its factorization.

28506918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13980.

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 28506918 is about 5339.1870167658. The cubic root of 28506918 is about 305.4804503353.

The spelling of 28506918 in words is "twenty-eight million, five hundred six thousand, nine hundred eighteen".