28774427 has 4 divisors (see below), whose sum is σ = 31390296. Its totient is φ = 26158560.

The previous prime is 28774399. The next prime is 28774441. The reversal of 28774427 is 72447782.

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 28774427 - 2⁶ = 28774363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28774457) 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, 1307918 + ... + 1307939.

It is an arithmetic number, because the mean of its divisors is an integer number (7847574).

Almost surely, 2^28774427 is an apocalyptic number.

28774427 is a deficient number, since it is larger than the sum of its proper divisors (2615869).

28774427 is a wasteful number, since it uses less digits than its factorization.

28774427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2615868.

The product of its digits is 175616, while the sum is 41.

The square root of 28774427 is about 5364.1799932515. The cubic root of 28774427 is about 306.4330200207.

The spelling of 28774427 in words is "twenty-eight million, seven hundred seventy-four thousand, four hundred twenty-seven".