28440469 has 2 divisors, whose sum is σ = 28440470. Its totient is φ = 28440468.

The previous prime is 28440449. The next prime is 28440491. The reversal of 28440469 is 96404482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27562500 + 877969 = 5250^2 + 937^2 .

It is a cyclic number.

It is not a de Polignac number, because 28440469 - 2⁷ = 28440341 is a prime.

It is a super-2 number, since 2×28440469² = 1617720553879922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28440409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14220234 + 14220235.

It is an arithmetic number, because the mean of its divisors is an integer number (14220235).

Almost surely, 2^28440469 is an apocalyptic number.

It is an amenable number.

28440469 is a deficient number, since it is larger than the sum of its proper divisors (1).

28440469 is an equidigital number, since it uses as much as digits as its factorization.

28440469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 37.

The square root of 28440469 is about 5332.9606223935. The cubic root of 28440469 is about 305.2429095979.

The spelling of 28440469 in words is "twenty-eight million, four hundred forty thousand, four hundred sixty-nine".