28798777 has 16 divisors (see below), whose sum is σ = 33903232. Its totient is φ = 23950080.

The previous prime is 28798751. The next prime is 28798793. The reversal of 28798777 is 77789782.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-28798777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28798717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72343 + ... + 72739.

It is an arithmetic number, because the mean of its divisors is an integer number (2118952).

Almost surely, 2^28798777 is an apocalyptic number.

It is an amenable number.

28798777 is a deficient number, since it is larger than the sum of its proper divisors (5104455).

28798777 is a wasteful number, since it uses less digits than its factorization.

28798777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688.

The product of its digits is 2765952, while the sum is 55.

The square root of 28798777 is about 5366.4491984924. The cubic root of 28798777 is about 306.5194340236.

The spelling of 28798777 in words is "twenty-eight million, seven hundred ninety-eight thousand, seven hundred seventy-seven".