28867261 has 2 divisors, whose sum is σ = 28867262. Its totient is φ = 28867260.

The previous prime is 28867253. The next prime is 28867271. The reversal of 28867261 is 16276882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19980900 + 8886361 = 4470^2 + 2981^2 .

It is a cyclic number.

It is not a de Polignac number, because 28867261 - 2³ = 28867253 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28867211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14433630 + 14433631.

It is an arithmetic number, because the mean of its divisors is an integer number (14433631).

Almost surely, 2^28867261 is an apocalyptic number.

It is an amenable number.

28867261 is a deficient number, since it is larger than the sum of its proper divisors (1).

28867261 is an equidigital number, since it uses as much as digits as its factorization.

28867261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 40.

The square root of 28867261 is about 5372.8261650643. The cubic root of 28867261 is about 306.7622112237.

The spelling of 28867261 in words is "twenty-eight million, eight hundred sixty-seven thousand, two hundred sixty-one".