28638744 has 48 divisors (see below), whose sum is σ = 76074600. Its totient is φ = 8982528.

The previous prime is 28638739. The next prime is 28638767. The reversal of 28638744 is 44783682.

It is a junction number, because it is equal to n+sod(n) for n = 28638696 and 28638705.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4872 + ... + 9000.

Almost surely, 2^28638744 is an apocalyptic number.

28638744 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28638744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38037300).

28638744 is an abundant number, since it is smaller than the sum of its proper divisors (47435856).

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

28638744 is a wasteful number, since it uses less digits than its factorization.

28638744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4172 (or 4151 counting only the distinct ones).

The product of its digits is 258048, while the sum is 42.

The square root of 28638744 is about 5351.5179155077. The cubic root of 28638744 is about 305.9506093124.

The spelling of 28638744 in words is "twenty-eight million, six hundred thirty-eight thousand, seven hundred forty-four".