28477489 has 2 divisors, whose sum is σ = 28477490. Its totient is φ = 28477488.

The previous prime is 28477487. The next prime is 28477529. The reversal of 28477489 is 98477482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24088464 + 4389025 = 4908^2 + 2095^2 .

It is a cyclic number.

It is not a de Polignac number, because 28477489 - 2¹ = 28477487 is a prime.

Together with 28477487, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28477487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14238744 + 14238745.

It is an arithmetic number, because the mean of its divisors is an integer number (14238745).

Almost surely, 2^28477489 is an apocalyptic number.

It is an amenable number.

28477489 is a deficient number, since it is larger than the sum of its proper divisors (1).

28477489 is an equidigital number, since it uses as much as digits as its factorization.

28477489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 903168, while the sum is 49.

The square root of 28477489 is about 5336.4303612059. The cubic root of 28477489 is about 305.3752936439.

The spelling of 28477489 in words is "twenty-eight million, four hundred seventy-seven thousand, four hundred eighty-nine".