28773750 has 40 divisors (see below), whose sum is σ = 71920728. Its totient is φ = 7672000.

The previous prime is 28773749. The next prime is 28773779. The reversal of 28773750 is 5737782.

It is a junction number, because it is equal to n+sod(n) for n = 28773699 and 28773708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 87 + ... + 7586.

Almost surely, 2^28773750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28773750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35960364).

28773750 is an abundant number, since it is smaller than the sum of its proper divisors (43146978).

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

28773750 is an equidigital number, since it uses as much as digits as its factorization.

28773750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7698 (or 7683 counting only the distinct ones).

The product of its (nonzero) digits is 82320, while the sum is 39.

The square root of 28773750 is about 5364.1168891067. The cubic root of 28773750 is about 306.4306167666.

The spelling of 28773750 in words is "twenty-eight million, seven hundred seventy-three thousand, seven hundred fifty".