28297994 has 8 divisors (see below), whose sum is σ = 42717828. Its totient is φ = 14058720.

The previous prime is 28297963. The next prime is 28298021. The reversal of 28297994 is 49979282.

It can be written as a sum of positive squares in 2 ways, for example, as 26574025 + 1723969 = 5155^2 + 1313^2 .

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, 44747 + ... + 45374.

Almost surely, 2^28297994 is an apocalyptic number.

28297994 is a deficient number, since it is larger than the sum of its proper divisors (14419834).

28297994 is a wasteful number, since it uses less digits than its factorization.

28297994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90280.

The product of its digits is 653184, while the sum is 50.

The square root of 28297994 is about 5319.5858861381. The cubic root of 28297994 is about 304.7323424458.

The spelling of 28297994 in words is "twenty-eight million, two hundred ninety-seven thousand, nine hundred ninety-four".