28424473 has 24 divisors (see below), whose sum is σ = 36712256. Its totient is φ = 21526560.

The previous prime is 28424471. The next prime is 28424479. The reversal of 28424473 is 37442482.

It is not a de Polignac number, because 28424473 - 2¹ = 28424471 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28424471) 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 23 ways as a sum of consecutive naturals, for example, 30886 + ... + 31792.

Almost surely, 2^28424473 is an apocalyptic number.

It is an amenable number.

28424473 is a deficient number, since it is larger than the sum of its proper divisors (8287783).

28424473 is a wasteful number, since it uses less digits than its factorization.

28424473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973 (or 962 counting only the distinct ones).

The product of its digits is 43008, while the sum is 34.

The square root of 28424473 is about 5331.4606816519. The cubic root of 28424473 is about 305.1856721303.

Subtracting 28424473 from its reverse (37442482), we obtain a square (9018009 = 3003²).

The spelling of 28424473 in words is "twenty-eight million, four hundred twenty-four thousand, four hundred seventy-three".