28073136 has 80 divisors (see below), whose sum is σ = 89272064. Its totient is φ = 7402752.

The previous prime is 28073117. The next prime is 28073141. The reversal of 28073136 is 63137082.

It is a super-4 number, since 4×28073136⁴ (a number of 31 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1155 + ... + 7581.

Almost surely, 2^28073136 is an apocalyptic number.

28073136 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28073136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44636032).

28073136 is an abundant number, since it is smaller than the sum of its proper divisors (61198928).

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

28073136 is a wasteful number, since it uses less digits than its factorization.

28073136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6458 (or 6452 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 28073136 is about 5298.4088177490. The cubic root of 28073136 is about 303.9230530090.

The spelling of 28073136 in words is "twenty-eight million, seventy-three thousand, one hundred thirty-six".