28774778 has 16 divisors (see below), whose sum is σ = 48107520. Its totient is φ = 12828096.

The previous prime is 28774777. The next prime is 28774793. The reversal of 28774778 is 87747782.

It is not an unprimeable number, because it can be changed into a prime (28774777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21626 + ... + 22917.

It is an arithmetic number, because the mean of its divisors is an integer number (3006720).

Almost surely, 2^28774778 is an apocalyptic number.

28774778 is a deficient number, since it is larger than the sum of its proper divisors (19332742).

28774778 is a wasteful number, since it uses less digits than its factorization.

28774778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44581.

The product of its digits is 1229312, while the sum is 50.

The square root of 28774778 is about 5364.2127101747. The cubic root of 28774778 is about 306.4342660062.

The spelling of 28774778 in words is "twenty-eight million, seven hundred seventy-four thousand, seven hundred seventy-eight".