28406641 has 2 divisors, whose sum is σ = 28406642. Its totient is φ = 28406640.

The previous prime is 28406629. The next prime is 28406647. The reversal of 28406641 is 14660482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16573041 + 11833600 = 4071^2 + 3440^2 .

It is a cyclic number.

It is not a de Polignac number, because 28406641 - 2⁷ = 28406513 is a prime.

It is not a weakly prime, because it can be changed into another prime (28406647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14203320 + 14203321.

It is an arithmetic number, because the mean of its divisors is an integer number (14203321).

Almost surely, 2^28406641 is an apocalyptic number.

It is an amenable number.

28406641 is a deficient number, since it is larger than the sum of its proper divisors (1).

28406641 is an equidigital number, since it uses as much as digits as its factorization.

28406641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 28406641 is about 5329.7880820911. The cubic root of 28406641 is about 305.1218397029.

The spelling of 28406641 in words is "twenty-eight million, four hundred six thousand, six hundred forty-one".