28457136 has 80 divisors (see below), whose sum is σ = 86006400. Its totient is φ = 8983872.

The previous prime is 28457119. The next prime is 28457153. The reversal of 28457136 is 63175482.

28457136 is a `hidden beast` number, since 2 + 84 + 571 + 3 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (28457119) and next prime (28457153).

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

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 28457136.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 6475 + ... + 9941.

It is an arithmetic number, because the mean of its divisors is an integer number (1075080).

Almost surely, 2^28457136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28457136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43003200).

28457136 is an abundant number, since it is smaller than the sum of its proper divisors (57549264).

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

28457136 is a wasteful number, since it uses less digits than its factorization.

28457136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3503 (or 3491 counting only the distinct ones).

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

The square root of 28457136 is about 5334.5230339741. The cubic root of 28457136 is about 305.3025252356.

The spelling of 28457136 in words is "twenty-eight million, four hundred fifty-seven thousand, one hundred thirty-six".