28743994 has 8 divisors (see below), whose sum is σ = 43543188. Its totient is φ = 14229600.

The previous prime is 28743983. The next prime is 28744003. The reversal of 28743994 is 49934782.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 23961025 + 4782969 = 4895^2 + 2187^2 .

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

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, 70947 + ... + 71350.

Almost surely, 2^28743994 is an apocalyptic number.

28743994 is a deficient number, since it is larger than the sum of its proper divisors (14799194).

28743994 is a wasteful number, since it uses less digits than its factorization.

28743994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142400.

The product of its digits is 435456, while the sum is 46.

The square root of 28743994 is about 5361.3425557411. The cubic root of 28743994 is about 306.3249499189.

The spelling of 28743994 in words is "twenty-eight million, seven hundred forty-three thousand, nine hundred ninety-four".