28631443 has 2 divisors, whose sum is σ = 28631444. Its totient is φ = 28631442.

The previous prime is 28631429. The next prime is 28631459. The reversal of 28631443 is 34413682.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28631443 is a prime.

It is not a weakly prime, because it can be changed into another prime (28631843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14315721 + 14315722.

It is an arithmetic number, because the mean of its divisors is an integer number (14315722).

Almost surely, 2^28631443 is an apocalyptic number.

28631443 is a deficient number, since it is larger than the sum of its proper divisors (1).

28631443 is an equidigital number, since it uses as much as digits as its factorization.

28631443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 31.

The square root of 28631443 is about 5350.8357291175. The cubic root of 28631443 is about 305.9246079946.

The spelling of 28631443 in words is "twenty-eight million, six hundred thirty-one thousand, four hundred forty-three".