28690818 has 16 divisors (see below), whose sum is σ = 61795776. Its totient is φ = 8827920.

The previous prime is 28690811. The next prime is 28690819. The reversal of 28690818 is 81809682.

It is a self number, because there is not a number n which added to its sum of digits gives 28690818.

It is not an unprimeable number, because it can be changed into a prime (28690811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183838 + ... + 183993.

It is an arithmetic number, because the mean of its divisors is an integer number (3862236).

Almost surely, 2^28690818 is an apocalyptic number.

28690818 is an abundant number, since it is smaller than the sum of its proper divisors (33104958).

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

28690818 is a wasteful number, since it uses less digits than its factorization.

28690818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367849.

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 28690818 is about 5356.3810544060. The cubic root of 28690818 is about 306.1359343079.

The spelling of 28690818 in words is "twenty-eight million, six hundred ninety thousand, eight hundred eighteen".