28097424 has 30 divisors (see below), whose sum is σ = 78634166. Its totient is φ = 9365760.

The previous prime is 28097417. The next prime is 28097429. The reversal of 28097424 is 42479082.

It can be written as a sum of positive squares in only one way, i.e., 27878400 + 219024 = 5280^2 + 468^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28097429) 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 5 ways as a sum of consecutive naturals, for example, 97417 + ... + 97704.

Almost surely, 2^28097424 is an apocalyptic number.

28097424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28097424 is an abundant number, since it is smaller than the sum of its proper divisors (50536742).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28097424 is a wasteful number, since it uses less digits than its factorization.

28097424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195135 (or 195126 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 28097424 is about 5300.7003310883. The cubic root of 28097424 is about 304.0106759870.

The spelling of 28097424 in words is "twenty-eight million, ninety-seven thousand, four hundred twenty-four".