28345424 has 20 divisors (see below), whose sum is σ = 55023636. Its totient is φ = 14145792.

The previous prime is 28345423. The next prime is 28345433. The reversal of 28345424 is 42454382.

It can be written as a sum of positive squares in 2 ways, for example, as 19536400 + 8809024 = 4420^2 + 2968^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28345423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9092 + ... + 11804.

Almost surely, 2^28345424 is an apocalyptic number.

It is an amenable number.

28345424 is a deficient number, since it is larger than the sum of its proper divisors (26678212).

28345424 is a wasteful number, since it uses less digits than its factorization.

28345424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3374 (or 3368 counting only the distinct ones).

The product of its digits is 30720, while the sum is 32.

The square root of 28345424 is about 5324.0420734626. The cubic root of 28345424 is about 304.9025004131.

The spelling of 28345424 in words is "twenty-eight million, three hundred forty-five thousand, four hundred twenty-four".