28381528 has 32 divisors (see below), whose sum is σ = 61005600. Its totient is φ = 12125952.

The previous prime is 28381519. The next prime is 28381541. The reversal of 28381528 is 82518382.

It is a super-2 number, since 2×28381528² = 1611022263229568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25038 + ... + 26146.

It is an arithmetic number, because the mean of its divisors is an integer number (1906425).

Almost surely, 2^28381528 is an apocalyptic number.

28381528 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28381528 is an abundant number, since it is smaller than the sum of its proper divisors (32624072).

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

28381528 is a wasteful number, since it uses less digits than its factorization.

28381528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1579 (or 1575 counting only the distinct ones).

The product of its digits is 30720, while the sum is 37.

The square root of 28381528 is about 5327.4316513682. The cubic root of 28381528 is about 305.0318984823.

The spelling of 28381528 in words is "twenty-eight million, three hundred eighty-one thousand, five hundred twenty-eight".