28308894 has 8 divisors (see below), whose sum is σ = 56617800. Its totient is φ = 9436296.

The previous prime is 28308887. The next prime is 28308911. The reversal of 28308894 is 49880382.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

28308894 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2359069 + ... + 2359080.

It is an arithmetic number, because the mean of its divisors is an integer number (7077225).

Almost surely, 2^28308894 is an apocalyptic number.

28308894 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28308894 is a wasteful number, since it uses less digits than its factorization.

28308894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4718154.

The product of its (nonzero) digits is 110592, while the sum is 42.

The square root of 28308894 is about 5320.6103033393. The cubic root of 28308894 is about 304.7714636658.

The spelling of 28308894 in words is "twenty-eight million, three hundred eight thousand, eight hundred ninety-four".