28881541 has 4 divisors (see below), whose sum is σ = 31103212. Its totient is φ = 26659872.

The previous prime is 28881527. The next prime is 28881551. The reversal of 28881541 is 14518882.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2656900 + 26224641 = 1630^2 + 5121^2 .

It is a cyclic number.

It is not a de Polignac number, because 28881541 - 2¹¹ = 28879493 is a prime.

It is a super-3 number, since 3×28881541³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28881541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28881551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1110816 + ... + 1110841.

It is an arithmetic number, because the mean of its divisors is an integer number (7775803).

Almost surely, 2^28881541 is an apocalyptic number.

It is an amenable number.

28881541 is a deficient number, since it is larger than the sum of its proper divisors (2221671).

28881541 is a wasteful number, since it uses less digits than its factorization.

28881541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2221670.

The product of its digits is 20480, while the sum is 37.

The square root of 28881541 is about 5374.1549103092. The cubic root of 28881541 is about 306.8127857281.

The spelling of 28881541 in words is "twenty-eight million, eight hundred eighty-one thousand, five hundred forty-one".