28718444 has 24 divisors (see below), whose sum is σ = 52630368. Its totient is φ = 13685760.

The previous prime is 28718413. The next prime is 28718447. The reversal of 28718444 is 44481782.

It is a happy number.

It is a super-2 number, since 2×28718444² = 1649498051562272, which contains 22 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 28718398 and 28718407.

It is not an unprimeable number, because it can be changed into a prime (28718447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49484 + ... + 50060.

It is an arithmetic number, because the mean of its divisors is an integer number (2192932).

Almost surely, 2^28718444 is an apocalyptic number.

It is an amenable number.

28718444 is a deficient number, since it is larger than the sum of its proper divisors (23911924).

28718444 is a wasteful number, since it uses less digits than its factorization.

28718444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1145 (or 1143 counting only the distinct ones).

The product of its digits is 57344, while the sum is 38.

The square root of 28718444 is about 5358.9592273127. The cubic root of 28718444 is about 306.2341608357.

The spelling of 28718444 in words is "twenty-eight million, seven hundred eighteen thousand, four hundred forty-four".