28778750 has 160 divisors (see below), whose sum is σ = 75575808. Its totient is φ = 7920000.

The previous prime is 28778747. The next prime is 28778777. The reversal of 28778750 is 5787782.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1251239 + ... + 1251261.

Almost surely, 2^28778750 is an apocalyptic number.

28778750 is an abundant number, since it is smaller than the sum of its proper divisors (46797058).

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

28778750 is a wasteful number, since it uses less digits than its factorization.

28778750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76 (or 61 counting only the distinct ones).

The product of its (nonzero) digits is 219520, while the sum is 44.

The square root of 28778750 is about 5364.5829288026. The cubic root of 28778750 is about 306.4483651698.

The spelling of 28778750 in words is "twenty-eight million, seven hundred seventy-eight thousand, seven hundred fifty".