28867281 has 8 divisors (see below), whose sum is σ = 38600160. Its totient is φ = 19189632.

The previous prime is 28867273. The next prime is 28867283. The reversal of 28867281 is 18276882.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28867281 - 2³ = 28867273 is a prime.

It is a super-2 number, since 2×28867281² = 1666639824665922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28867283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12571 + ... + 14688.

It is an arithmetic number, because the mean of its divisors is an integer number (4825020).

Almost surely, 2^28867281 is an apocalyptic number.

It is an amenable number.

28867281 is a deficient number, since it is larger than the sum of its proper divisors (9732879).

28867281 is a wasteful number, since it uses less digits than its factorization.

28867281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27615.

The product of its digits is 86016, while the sum is 42.

The square root of 28867281 is about 5372.8280262819. The cubic root of 28867281 is about 306.7622820680.

The spelling of 28867281 in words is "twenty-eight million, eight hundred sixty-seven thousand, two hundred eighty-one".