28415489 has 2 divisors, whose sum is σ = 28415490. Its totient is φ = 28415488.

The previous prime is 28415479. The next prime is 28415531. The reversal of 28415489 is 98451482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22963264 + 5452225 = 4792^2 + 2335^2 .

It is a cyclic number.

It is not a de Polignac number, because 28415489 - 2²⁴ = 11638273 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (28415479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14207744 + 14207745.

It is an arithmetic number, because the mean of its divisors is an integer number (14207745).

Almost surely, 2^28415489 is an apocalyptic number.

It is an amenable number.

28415489 is a deficient number, since it is larger than the sum of its proper divisors (1).

28415489 is an equidigital number, since it uses as much as digits as its factorization.

28415489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92160, while the sum is 41.

The square root of 28415489 is about 5330.6180692299. The cubic root of 28415489 is about 305.1535158379.

The spelling of 28415489 in words is "twenty-eight million, four hundred fifteen thousand, four hundred eighty-nine".