28917744 has 20 divisors (see below), whose sum is σ = 74704296. Its totient is φ = 9639232.

The previous prime is 28917743. The next prime is 28917767. The reversal of 28917744 is 44771982.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28917696 and 28917705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28917743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 301179 + ... + 301274.

Almost surely, 2^28917744 is an apocalyptic number.

28917744 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28917744 is an abundant number, since it is smaller than the sum of its proper divisors (45786552).

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

28917744 is a wasteful number, since it uses less digits than its factorization.

28917744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602464 (or 602458 counting only the distinct ones).

The product of its digits is 112896, while the sum is 42.

The square root of 28917744 is about 5377.5221059518. The cubic root of 28917744 is about 306.9409287683.

The spelling of 28917744 in words is "twenty-eight million, nine hundred seventeen thousand, seven hundred forty-four".