28946921 has 2 divisors, whose sum is σ = 28946922. Its totient is φ = 28946920.

The previous prime is 28946917. The next prime is 28946927. The reversal of 28946921 is 12964982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24641296 + 4305625 = 4964^2 + 2075^2 .

It is a cyclic number.

It is not a de Polignac number, because 28946921 - 2² = 28946917 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28946927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14473460 + 14473461.

It is an arithmetic number, because the mean of its divisors is an integer number (14473461).

Almost surely, 2^28946921 is an apocalyptic number.

It is an amenable number.

28946921 is a deficient number, since it is larger than the sum of its proper divisors (1).

28946921 is an equidigital number, since it uses as much as digits as its factorization.

28946921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 41.

The square root of 28946921 is about 5380.2342885789. The cubic root of 28946921 is about 307.0441249835.

The spelling of 28946921 in words is "twenty-eight million, nine hundred forty-six thousand, nine hundred twenty-one".