28332541 has 4 divisors (see below), whose sum is σ = 28720732. Its totient is φ = 27944352.

The previous prime is 28332539. The next prime is 28332547. The reversal of 28332541 is 14523382.

28332541 = 366² + 367² + ... + 511².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14523382 = 2 ⋅7261691.

It can be written as a sum of positive squares in 2 ways, for example, as 7584516 + 20748025 = 2754^2 + 4555^2 .

It is a cyclic number.

It is not a de Polignac number, because 28332541 - 2¹ = 28332539 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28332547) 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, 193986 + ... + 194131.

It is an arithmetic number, because the mean of its divisors is an integer number (7180183).

Almost surely, 2^28332541 is an apocalyptic number.

It is an amenable number.

28332541 is a deficient number, since it is larger than the sum of its proper divisors (388191).

28332541 is an equidigital number, since it uses as much as digits as its factorization.

28332541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388190.

The product of its digits is 5760, while the sum is 28.

The square root of 28332541 is about 5322.8320469464. The cubic root of 28332541 is about 304.8563006671.

The spelling of 28332541 in words is "twenty-eight million, three hundred thirty-two thousand, five hundred forty-one".