28200778 has 8 divisors (see below), whose sum is σ = 42377220. Its totient is φ = 14075040.

The previous prime is 28200749. The next prime is 28200779. The reversal of 28200778 is 87700282.

It can be written as a sum of positive squares in 2 ways, for example, as 26450449 + 1750329 = 5143^2 + 1323^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (28200779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11253 + ... + 13528.

Almost surely, 2^28200778 is an apocalyptic number.

28200778 is a deficient number, since it is larger than the sum of its proper divisors (14176442).

28200778 is a wasteful number, since it uses less digits than its factorization.

28200778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25352.

The product of its (nonzero) digits is 12544, while the sum is 34.

The square root of 28200778 is about 5310.4404713733. The cubic root of 28200778 is about 304.3829790588.

The spelling of 28200778 in words is "twenty-eight million, two hundred thousand, seven hundred seventy-eight".