28141581 has 32 divisors (see below), whose sum is σ = 42658560. Its totient is φ = 16372224.

The previous prime is 28141577. The next prime is 28141591. The reversal of 28141581 is 18514182.

It is a happy number.

It is not a de Polignac number, because 28141581 - 2² = 28141577 is a prime.

It is a super-2 number, since 2×28141581² = 1583897162359122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28141501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 122775 + ... + 123003.

It is an arithmetic number, because the mean of its divisors is an integer number (1333080).

Almost surely, 2^28141581 is an apocalyptic number.

It is an amenable number.

28141581 is a deficient number, since it is larger than the sum of its proper divisors (14516979).

28141581 is a wasteful number, since it uses less digits than its factorization.

28141581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405.

The product of its digits is 2560, while the sum is 30.

The square root of 28141581 is about 5304.8639002334. The cubic root of 28141581 is about 304.1698504035.

The spelling of 28141581 in words is "twenty-eight million, one hundred forty-one thousand, five hundred eighty-one".