28978633 has 2 divisors, whose sum is σ = 28978634. Its totient is φ = 28978632.

The previous prime is 28978619. The next prime is 28978637. The reversal of 28978633 is 33687982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26749584 + 2229049 = 5172^2 + 1493^2 .

It is a cyclic number.

It is not a de Polignac number, because 28978633 - 2¹³ = 28970441 is a prime.

It is a super-2 number, since 2×28978633² = 1679522341097378, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28978637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14489316 + 14489317.

It is an arithmetic number, because the mean of its divisors is an integer number (14489317).

Almost surely, 2^28978633 is an apocalyptic number.

It is an amenable number.

28978633 is a deficient number, since it is larger than the sum of its proper divisors (1).

28978633 is an equidigital number, since it uses as much as digits as its factorization.

28978633 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 46.

The square root of 28978633 is about 5383.1805654278. The cubic root of 28978633 is about 307.1562086344.

The spelling of 28978633 in words is "twenty-eight million, nine hundred seventy-eight thousand, six hundred thirty-three".