28774547 has 4 divisors (see below), whose sum is σ = 29043576. Its totient is φ = 28505520.

The previous prime is 28774513. The next prime is 28774561. The reversal of 28774547 is 74547782.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28774547 - 2¹⁰ = 28773523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28774498 and 28774507.

It is not an unprimeable number, because it can be changed into a prime (28774507) 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, 134354 + ... + 134567.

It is an arithmetic number, because the mean of its divisors is an integer number (7260894).

Almost surely, 2^28774547 is an apocalyptic number.

28774547 is a deficient number, since it is larger than the sum of its proper divisors (269029).

28774547 is a wasteful number, since it uses less digits than its factorization.

28774547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269028.

The product of its digits is 439040, while the sum is 44.

The square root of 28774547 is about 5364.1911785469. The cubic root of 28774547 is about 306.4334459998.

The spelling of 28774547 in words is "twenty-eight million, seven hundred seventy-four thousand, five hundred forty-seven".