28411691 has 16 divisors (see below), whose sum is σ = 36250368. Its totient is φ = 21621600.

The previous prime is 28411681. The next prime is 28411699. The reversal of 28411691 is 19611482.

It is not a de Polignac number, because 28411691 - 2¹⁸ = 28149547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28411699) 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 15 ways as a sum of consecutive naturals, for example, 980 + ... + 7601.

It is an arithmetic number, because the mean of its divisors is an integer number (2265648).

Almost surely, 2^28411691 is an apocalyptic number.

28411691 is a deficient number, since it is larger than the sum of its proper divisors (7838677).

28411691 is a wasteful number, since it uses less digits than its factorization.

28411691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8642.

The product of its digits is 3456, while the sum is 32.

The square root of 28411691 is about 5330.2618134572. The cubic root of 28411691 is about 305.1399196769.

The spelling of 28411691 in words is "twenty-eight million, four hundred eleven thousand, six hundred ninety-one".