28181794 has 8 divisors (see below), whose sum is σ = 43730460. Its totient is φ = 13604976.

The previous prime is 28181789. The next prime is 28181809. The reversal of 28181794 is 49718182.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 26656569 + 1525225 = 5163^2 + 1235^2 .

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, 242889 + ... + 243004.

Almost surely, 2^28181794 is an apocalyptic number.

28181794 is a deficient number, since it is larger than the sum of its proper divisors (15548666).

28181794 is a wasteful number, since it uses less digits than its factorization.

28181794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485924.

The product of its digits is 32256, while the sum is 40.

The square root of 28181794 is about 5308.6527481085. The cubic root of 28181794 is about 304.3146629343.

The spelling of 28181794 in words is "twenty-eight million, one hundred eighty-one thousand, seven hundred ninety-four".