28644774 has 8 divisors (see below), whose sum is σ = 57289560. Its totient is φ = 9548256.

The previous prime is 28644769. The next prime is 28644797. The reversal of 28644774 is 47744682.

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

28644774 is an admirable number.

It is a super-2 number, since 2×28644774² = 1641046155022152, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 2387059 + ... + 2387070.

It is an arithmetic number, because the mean of its divisors is an integer number (7161195).

Almost surely, 2^28644774 is an apocalyptic number.

28644774 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28644774 is a wasteful number, since it uses less digits than its factorization.

28644774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4774134.

The product of its digits is 301056, while the sum is 42.

The square root of 28644774 is about 5352.0812774098. The cubic root of 28644774 is about 305.9720808395.

The spelling of 28644774 in words is "twenty-eight million, six hundred forty-four thousand, seven hundred seventy-four".