28073538 has 24 divisors (see below), whose sum is σ = 62789376. Its totient is φ = 9055800.

The previous prime is 28073533. The next prime is 28073567. The reversal of 28073538 is 83537082.

It is not an unprimeable number, because it can be changed into a prime (28073533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24598 + ... + 25713.

It is an arithmetic number, because the mean of its divisors is an integer number (2616224).

Almost surely, 2^28073538 is an apocalyptic number.

28073538 is an abundant number, since it is smaller than the sum of its proper divisors (34715838).

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

28073538 is a wasteful number, since it uses less digits than its factorization.

28073538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50350 (or 50347 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 28073538 is about 5298.4467535307. The cubic root of 28073538 is about 303.9245037018.

The spelling of 28073538 in words is "twenty-eight million, seventy-three thousand, five hundred thirty-eight".