28972424 has 16 divisors (see below), whose sum is σ = 58502220. Its totient is φ = 13371840.

The previous prime is 28972423. The next prime is 28972451. The reversal of 28972424 is 42427982.

It can be written as a sum of positive squares in 2 ways, for example, as 24900100 + 4072324 = 4990^2 + 2018^2 .

It is not an unprimeable number, because it can be changed into a prime (28972423) 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, 139187 + ... + 139394.

Almost surely, 2^28972424 is an apocalyptic number.

It is an amenable number.

28972424 is an abundant number, since it is smaller than the sum of its proper divisors (29529796).

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

28972424 is a wasteful number, since it uses less digits than its factorization.

28972424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278600 (or 278596 counting only the distinct ones).

The product of its digits is 64512, while the sum is 38.

The square root of 28972424 is about 5382.6038308610. The cubic root of 28972424 is about 307.1342698364.

The spelling of 28972424 in words is "twenty-eight million, nine hundred seventy-two thousand, four hundred twenty-four".