28033994 has 4 divisors (see below), whose sum is σ = 42050994. Its totient is φ = 14016996.

The previous prime is 28033991. The next prime is 28034009. The reversal of 28033994 is 49933082.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16507969 + 11526025 = 4063^2 + 3395^2 .

It is not an unprimeable number, because it can be changed into a prime (28033991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7008497 + ... + 7008500.

Almost surely, 2^28033994 is an apocalyptic number.

28033994 is a deficient number, since it is larger than the sum of its proper divisors (14017000).

28033994 is a wasteful number, since it uses less digits than its factorization.

28033994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14016999.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 28033994 is about 5294.7137788553. The cubic root of 28033994 is about 303.7817353532.

The spelling of 28033994 in words is "twenty-eight million, thirty-three thousand, nine hundred ninety-four".