28802321 has 2 divisors, whose sum is σ = 28802322. Its totient is φ = 28802320.

The previous prime is 28802311. The next prime is 28802327. The reversal of 28802321 is 12320882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25361296 + 3441025 = 5036^2 + 1855^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28802321 is a prime.

It is not a weakly prime, because it can be changed into another prime (28802327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14401160 + 14401161.

It is an arithmetic number, because the mean of its divisors is an integer number (14401161).

Almost surely, 2^28802321 is an apocalyptic number.

It is an amenable number.

28802321 is a deficient number, since it is larger than the sum of its proper divisors (1).

28802321 is an equidigital number, since it uses as much as digits as its factorization.

28802321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 28802321 is about 5366.7793880502. The cubic root of 28802321 is about 306.5320070149.

The spelling of 28802321 in words is "twenty-eight million, eight hundred two thousand, three hundred twenty-one".