28749400 has 48 divisors (see below), whose sum is σ = 69013440. Its totient is φ = 11126400.

The previous prime is 28749389. The next prime is 28749419. The reversal of 28749400 is 494782.

It is a happy number.

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, 3882 + ... + 8518.

It is an arithmetic number, because the mean of its divisors is an integer number (1437780).

Almost surely, 2^28749400 is an apocalyptic number.

28749400 is a gapful number since it is divisible by the number (20) 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 28749400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34506720).

28749400 is an abundant number, since it is smaller than the sum of its proper divisors (40264040).

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

28749400 is a wasteful number, since it uses less digits than its factorization.

28749400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4684 (or 4675 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 28749400 is about 5361.8466968014. The cubic root of 28749400 is about 306.3441526420.

The spelling of 28749400 in words is "twenty-eight million, seven hundred forty-nine thousand, four hundred".