28408057 has 2 divisors, whose sum is σ = 28408058. Its totient is φ = 28408056.

The previous prime is 28408033. The next prime is 28408063. The reversal of 28408057 is 75080482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24098281 + 4309776 = 4909^2 + 2076^2 .

It is a cyclic number.

It is not a de Polignac number, because 28408057 - 2²³ = 20019449 is a prime.

It is not a weakly prime, because it can be changed into another prime (28408007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14204028 + 14204029.

It is an arithmetic number, because the mean of its divisors is an integer number (14204029).

Almost surely, 2^28408057 is an apocalyptic number.

It is an amenable number.

28408057 is a deficient number, since it is larger than the sum of its proper divisors (1).

28408057 is an equidigital number, since it uses as much as digits as its factorization.

28408057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 28408057 is about 5329.9209187379. The cubic root of 28408057 is about 305.1269094722.

The spelling of 28408057 in words is "twenty-eight million, four hundred eight thousand, fifty-seven".