28195818 has 32 divisors (see below), whose sum is σ = 64821120. Its totient is φ = 8009280.

The previous prime is 28195807. The next prime is 28195819. The reversal of 28195818 is 81859182.

It is a Harshad number since it is a multiple of its sum of digits (42).

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 28195818.

It is not an unprimeable number, because it can be changed into a prime (28195819) 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, 5748 + ... + 9456.

It is an arithmetic number, because the mean of its divisors is an integer number (2025660).

Almost surely, 2^28195818 is an apocalyptic number.

28195818 is an abundant number, since it is smaller than the sum of its proper divisors (36625302).

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

28195818 is a wasteful number, since it uses less digits than its factorization.

28195818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3902.

The product of its digits is 46080, while the sum is 42.

The square root of 28195818 is about 5309.9734462613. The cubic root of 28195818 is about 304.3651328833.

The spelling of 28195818 in words is "twenty-eight million, one hundred ninety-five thousand, eight hundred eighteen".