28993061 has 4 divisors (see below), whose sum is σ = 29040972. Its totient is φ = 28945152.

The previous prime is 28993049. The next prime is 28993093. The reversal of 28993061 is 16039982.

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 2788900 + 26204161 = 1670^2 + 5119^2 .

It is a cyclic number.

It is not a de Polignac number, because 28993061 - 2¹⁴ = 28976677 is a prime.

It is a super-2 number, since 2×28993061² = 1681195172299442, 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 (28993001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23036 + ... + 24261.

It is an arithmetic number, because the mean of its divisors is an integer number (7260243).

Almost surely, 2^28993061 is an apocalyptic number.

It is an amenable number.

28993061 is a deficient number, since it is larger than the sum of its proper divisors (47911).

28993061 is an equidigital number, since it uses as much as digits as its factorization.

28993061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47910.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 28993061 is about 5384.5204986145. The cubic root of 28993061 is about 307.2071762387.

The spelling of 28993061 in words is "twenty-eight million, nine hundred ninety-three thousand, sixty-one".