28057536 has 112 divisors (see below), whose sum is σ = 88900000. Its totient is φ = 8626176.

The previous prime is 28057501. The next prime is 28057553. The reversal of 28057536 is 63575082.

28057536 is a `hidden beast` number, since 2 + 80 + 575 + 3 + 6 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 28057536.

It is a congruent number.

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, 21840 + ... + 23088.

It is an arithmetic number, because the mean of its divisors is an integer number (793750).

Almost surely, 2^28057536 is an apocalyptic number.

28057536 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 28057536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44450000).

28057536 is an abundant number, since it is smaller than the sum of its proper divisors (60842464).

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

28057536 is a wasteful number, since it uses less digits than its factorization.

28057536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283 (or 1267 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 28057536 is about 5296.9364730946. The cubic root of 28057536 is about 303.8667467701.

28057536 divided by its sum of digits (36) gives a triangular number (779376 = T₁₂₄₈).

The spelling of 28057536 in words is "twenty-eight million, fifty-seven thousand, five hundred thirty-six".