28878750 has 120 divisors (see below), whose sum is σ = 83335824. Its totient is φ = 7200000.

The previous prime is 28878749. The next prime is 28878761. The reversal of 28878750 is 5787882.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 28878696 and 28878705.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 191175 + ... + 191325.

Almost surely, 2^28878750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28878750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41667912).

28878750 is an abundant number, since it is smaller than the sum of its proper divisors (54457074).

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

28878750 is a wasteful number, since it uses less digits than its factorization.

28878750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196 (or 178 counting only the distinct ones).

The product of its (nonzero) digits is 250880, while the sum is 45.

The square root of 28878750 is about 5373.8952353019. The cubic root of 28878750 is about 306.8029023442.

The spelling of 28878750 in words is "twenty-eight million, eight hundred seventy-eight thousand, seven hundred fifty".