28477469 has 4 divisors (see below), whose sum is σ = 28729596. Its totient is φ = 28225344.

The previous prime is 28477459. The next prime is 28477487. The reversal of 28477469 is 96477482.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15960025 + 12517444 = 3995^2 + 3538^2 .

It is a cyclic number.

It is not a de Polignac number, because 28477469 - 2⁸ = 28477213 is a prime.

It is a super-2 number, since 2×28477469² = 1621932481291922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28477429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125894 + ... + 126119.

It is an arithmetic number, because the mean of its divisors is an integer number (7182399).

Almost surely, 2^28477469 is an apocalyptic number.

It is an amenable number.

28477469 is a deficient number, since it is larger than the sum of its proper divisors (252127).

28477469 is a wasteful number, since it uses less digits than its factorization.

28477469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252126.

The product of its digits is 677376, while the sum is 47.

The square root of 28477469 is about 5336.4284872937. The cubic root of 28477469 is about 305.3752221546.

The spelling of 28477469 in words is "twenty-eight million, four hundred seventy-seven thousand, four hundred sixty-nine".