28190864 has 20 divisors (see below), whose sum is σ = 58821756. Its totient is φ = 13011072.

The previous prime is 28190863. The next prime is 28190881. The reversal of 28190864 is 46809182.

It can be written as a sum of positive squares in 2 ways, for example, as 14500864 + 13690000 = 3808^2 + 3700^2 .

It is not an unprimeable number, because it can be changed into a prime (28190861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67559 + ... + 67974.

Almost surely, 2^28190864 is an apocalyptic number.

It is an amenable number.

28190864 is an abundant number, since it is smaller than the sum of its proper divisors (30630892).

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

28190864 is a wasteful number, since it uses less digits than its factorization.

28190864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135554 (or 135548 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 28190864 is about 5309.5069450939. The cubic root of 28190864 is about 304.3473062067.

The spelling of 28190864 in words is "twenty-eight million, one hundred ninety thousand, eight hundred sixty-four".