28993994 has 8 divisors (see below), whose sum is σ = 44086980. Its totient is φ = 14298336.

The previous prime is 28993967. The next prime is 28993999. The reversal of 28993994 is 49939982.

It can be written as a sum of positive squares in 2 ways, for example, as 28249225 + 744769 = 5315^2 + 863^2 .

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

It is not an unprimeable number, because it can be changed into a prime (28993999) 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, 99149 + ... + 99440.

Almost surely, 2^28993994 is an apocalyptic number.

28993994 is a deficient number, since it is larger than the sum of its proper divisors (15092986).

28993994 is a wasteful number, since it uses less digits than its factorization.

28993994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198664.

The product of its digits is 1259712, while the sum is 53.

The square root of 28993994 is about 5384.6071351585. The cubic root of 28993994 is about 307.2104715239.

The spelling of 28993994 in words is "twenty-eight million, nine hundred ninety-three thousand, nine hundred ninety-four".