28227977 has 4 divisors (see below), whose sum is σ = 29713680. Its totient is φ = 26742276.

The previous prime is 28227961. The next prime is 28227989. The reversal of 28227977 is 77972282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28227977 - 2⁴ = 28227961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28227907) 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, 742823 + ... + 742860.

It is an arithmetic number, because the mean of its divisors is an integer number (7428420).

Almost surely, 2^28227977 is an apocalyptic number.

It is an amenable number.

28227977 is a deficient number, since it is larger than the sum of its proper divisors (1485703).

28227977 is a wasteful number, since it uses less digits than its factorization.

28227977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1485702.

The product of its digits is 197568, while the sum is 44.

The square root of 28227977 is about 5313.0007528703. Note that the first 3 decimals coincide. The cubic root of 28227977 is about 304.4808044032.

The spelling of 28227977 in words is "twenty-eight million, two hundred twenty-seven thousand, nine hundred seventy-seven".