28325381 has 12 divisors (see below), whose sum is σ = 33045408. Its totient is φ = 24208632.

The previous prime is 28325377. The next prime is 28325393. The reversal of 28325381 is 18352382.

It is not a de Polignac number, because 28325381 - 2² = 28325377 is a prime.

It is a super-2 number, since 2×28325381² = 1604654417590322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28325981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23270 + ... + 24456.

It is an arithmetic number, because the mean of its divisors is an integer number (2753784).

Almost surely, 2^28325381 is an apocalyptic number.

It is an amenable number.

28325381 is a deficient number, since it is larger than the sum of its proper divisors (4720027).

28325381 is a wasteful number, since it uses less digits than its factorization.

28325381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1688 (or 1681 counting only the distinct ones).

The product of its digits is 11520, while the sum is 32.

The square root of 28325381 is about 5322.1594301561. The cubic root of 28325381 is about 304.8306181253.

The spelling of 28325381 in words is "twenty-eight million, three hundred twenty-five thousand, three hundred eighty-one".