28633331 has 2 divisors, whose sum is σ = 28633332. Its totient is φ = 28633330.

The previous prime is 28633291. The next prime is 28633343. The reversal of 28633331 is 13333682.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28633331 is a prime.

It is a super-2 number, since 2×28633331² = 1639735288311122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 28633294 and 28633303.

It is not a weakly prime, because it can be changed into another prime (28633351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14316665 + 14316666.

It is an arithmetic number, because the mean of its divisors is an integer number (14316666).

Almost surely, 2^28633331 is an apocalyptic number.

28633331 is a deficient number, since it is larger than the sum of its proper divisors (1).

28633331 is an equidigital number, since it uses as much as digits as its factorization.

28633331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 29.

The square root of 28633331 is about 5351.0121472484. The cubic root of 28633331 is about 305.9313322216.

The spelling of 28633331 in words is "twenty-eight million, six hundred thirty-three thousand, three hundred thirty-one".