28057575 has 48 divisors (see below), whose sum is σ = 57107456. Its totient is φ = 11836800.

The previous prime is 28057553. The next prime is 28057577. The reversal of 28057575 is 57575082.

It is not a de Polignac number, because 28057575 - 2¹² = 28053479 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28057577) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4770 + ... + 8880.

Almost surely, 2^28057575 is an apocalyptic number.

28057575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28057575 is an abundant number, since it is smaller than the sum of its proper divisors (29049881).

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

28057575 is a wasteful number, since it uses less digits than its factorization.

28057575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4144 (or 4139 counting only the distinct ones).

The product of its (nonzero) digits is 98000, while the sum is 39.

The square root of 28057575 is about 5296.9401544665. The cubic root of 28057575 is about 303.8668875617.

The spelling of 28057575 in words is "twenty-eight million, fifty-seven thousand, five hundred seventy-five".