28649623 has 2 divisors, whose sum is σ = 28649624. Its totient is φ = 28649622.

The previous prime is 28649617. The next prime is 28649639. The reversal of 28649623 is 32694682.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28649623 - 2⁹ = 28649111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28649123) 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, 14324811 + 14324812.

It is an arithmetic number, because the mean of its divisors is an integer number (14324812).

Almost surely, 2^28649623 is an apocalyptic number.

28649623 is a deficient number, since it is larger than the sum of its proper divisors (1).

28649623 is an equidigital number, since it uses as much as digits as its factorization.

28649623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 40.

The square root of 28649623 is about 5352.5342595821. The cubic root of 28649623 is about 305.9893448951.

The spelling of 28649623 in words is "twenty-eight million, six hundred forty-nine thousand, six hundred twenty-three".