28132481 has 4 divisors (see below), whose sum is σ = 30296532. Its totient is φ = 25968432.

The previous prime is 28132471. The next prime is 28132487. The reversal of 28132481 is 18423182.

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 19228225 + 8904256 = 4385^2 + 2984^2 .

It is a cyclic number.

It is not a de Polignac number, because 28132481 - 2⁶ = 28132417 is a prime.

It is a super-2 number, since 2×28132481² = 1582872974430722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28132487) 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, 1082006 + ... + 1082031.

It is an arithmetic number, because the mean of its divisors is an integer number (7574133).

Almost surely, 2^28132481 is an apocalyptic number.

It is an amenable number.

28132481 is a deficient number, since it is larger than the sum of its proper divisors (2164051).

28132481 is a wasteful number, since it uses less digits than its factorization.

28132481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2164050.

The product of its digits is 3072, while the sum is 29.

The square root of 28132481 is about 5304.0061274474. The cubic root of 28132481 is about 304.1370609161.

The spelling of 28132481 in words is "twenty-eight million, one hundred thirty-two thousand, four hundred eighty-one".