28638274 has 8 divisors (see below), whose sum is σ = 49094208. Its totient is φ = 12273540.

The previous prime is 28638209. The next prime is 28638277. The reversal of 28638274 is 47283682.

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 (28638277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1022782 + ... + 1022809.

It is an arithmetic number, because the mean of its divisors is an integer number (6136776).

Almost surely, 2^28638274 is an apocalyptic number.

28638274 is a deficient number, since it is larger than the sum of its proper divisors (20455934).

28638274 is a wasteful number, since it uses less digits than its factorization.

28638274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2045600.

The product of its digits is 129024, while the sum is 40.

The square root of 28638274 is about 5351.4740025529. The cubic root of 28638274 is about 305.9489356173.

The spelling of 28638274 in words is "twenty-eight million, six hundred thirty-eight thousand, two hundred seventy-four".