28909994 has 8 divisors (see below), whose sum is σ = 43488900. Its totient is φ = 14413696.

The previous prime is 28909981. The next prime is 28910041. The reversal of 28909994 is 49990982.

It can be written as a sum of positive squares in 2 ways, for example, as 28761769 + 148225 = 5363^2 + 385^2 .

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

It is a Curzon 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, 19769 + ... + 21180.

Almost surely, 2^28909994 is an apocalyptic number.

28909994 is a deficient number, since it is larger than the sum of its proper divisors (14578906).

28909994 is a wasteful number, since it uses less digits than its factorization.

28909994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41304.

The product of its (nonzero) digits is 419904, while the sum is 50.

The square root of 28909994 is about 5376.8014655555. The cubic root of 28909994 is about 306.9135061043.

The spelling of 28909994 in words is "twenty-eight million, nine hundred nine thousand, nine hundred ninety-four".