28947469 has 4 divisors (see below), whose sum is σ = 30471040. Its totient is φ = 27423900.

The previous prime is 28947461. The next prime is 28947497. The reversal of 28947469 is 96474982.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28947469 - 2³ = 28947461 is a prime.

It is a super-2 number, since 2×28947469² = 1675911923011922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28947461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 761757 + ... + 761794.

It is an arithmetic number, because the mean of its divisors is an integer number (7617760).

Almost surely, 2^28947469 is an apocalyptic number.

It is an amenable number.

28947469 is a deficient number, since it is larger than the sum of its proper divisors (1523571).

28947469 is a wasteful number, since it uses less digits than its factorization.

28947469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1523570.

The product of its digits is 870912, while the sum is 49.

The square root of 28947469 is about 5380.2852154881. The cubic root of 28947469 is about 307.0460625427.

The spelling of 28947469 in words is "twenty-eight million, nine hundred forty-seven thousand, four hundred sixty-nine".