28900643 has 2 divisors, whose sum is σ = 28900644. Its totient is φ = 28900642.

The previous prime is 28900633. The next prime is 28900661. The reversal of 28900643 is 34600982.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28900643 - 2¹⁴ = 28884259 is a prime.

It is not a weakly prime, because it can be changed into another prime (28900633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14450321 + 14450322.

It is an arithmetic number, because the mean of its divisors is an integer number (14450322).

Almost surely, 2^28900643 is an apocalyptic number.

28900643 is a deficient number, since it is larger than the sum of its proper divisors (1).

28900643 is an equidigital number, since it uses as much as digits as its factorization.

28900643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 28900643 is about 5375.9318262046. The cubic root of 28900643 is about 306.8804119238.

The spelling of 28900643 in words is "twenty-eight million, nine hundred thousand, six hundred forty-three".