28882621 has 2 divisors, whose sum is σ = 28882622. Its totient is φ = 28882620.

The previous prime is 28882613. The next prime is 28882657. The reversal of 28882621 is 12628882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18610596 + 10272025 = 4314^2 + 3205^2 .

It is a cyclic number.

It is not a de Polignac number, because 28882621 - 2³ = 28882613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28882691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14441310 + 14441311.

It is an arithmetic number, because the mean of its divisors is an integer number (14441311).

Almost surely, 2^28882621 is an apocalyptic number.

It is an amenable number.

28882621 is a deficient number, since it is larger than the sum of its proper divisors (1).

28882621 is an equidigital number, since it uses as much as digits as its factorization.

28882621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24576, while the sum is 37.

The square root of 28882621 is about 5374.2553902843. The cubic root of 28882621 is about 306.8166100125.

The spelling of 28882621 in words is "twenty-eight million, eight hundred eighty-two thousand, six hundred twenty-one".