280228213 has 2 divisors, whose sum is σ = 280228214. Its totient is φ = 280228212.

The previous prime is 280228139. The next prime is 280228219. The reversal of 280228213 is 312822082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 271359729 + 8868484 = 16473^2 + 2978^2 .

It is a cyclic number.

It is not a de Polignac number, because 280228213 - 2¹³ = 280220021 is a prime.

It is a super-2 number, since 2×280228213² = 157055702722346738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280228219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140114106 + 140114107.

It is an arithmetic number, because the mean of its divisors is an integer number (140114107).

Almost surely, 2^280228213 is an apocalyptic number.

It is an amenable number.

280228213 is a deficient number, since it is larger than the sum of its proper divisors (1).

280228213 is an equidigital number, since it uses as much as digits as its factorization.

280228213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 280228213 is about 16740.0183094285. The cubic root of 280228213 is about 654.3909518322.

The spelling of 280228213 in words is "two hundred eighty million, two hundred twenty-eight thousand, two hundred thirteen".