28227961 has 2 divisors, whose sum is σ = 28227962. Its totient is φ = 28227960.

The previous prime is 28227943. The next prime is 28227989. The reversal of 28227961 is 16972282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26214400 + 2013561 = 5120^2 + 1419^2 .

It is a cyclic number.

It is not a de Polignac number, because 28227961 - 2⁹ = 28227449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28227961.

It is not a weakly prime, because it can be changed into another prime (28227911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14113980 + 14113981.

It is an arithmetic number, because the mean of its divisors is an integer number (14113981).

Almost surely, 2^28227961 is an apocalyptic number.

It is an amenable number.

28227961 is a deficient number, since it is larger than the sum of its proper divisors (1).

28227961 is an equidigital number, since it uses as much as digits as its factorization.

28227961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 37.

The square root of 28227961 is about 5312.9992471296. Note that the first 3 decimals coincide. The cubic root of 28227961 is about 304.4807468753.

The spelling of 28227961 in words is "twenty-eight million, two hundred twenty-seven thousand, nine hundred sixty-one".