28493611 has 4 divisors (see below), whose sum is σ = 28770352. Its totient is φ = 28216872.

The previous prime is 28493561. The next prime is 28493627. The reversal of 28493611 is 11639482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11639482 = 2 ⋅5819741.

It is a cyclic number.

It is not a de Polignac number, because 28493611 - 2¹¹ = 28491563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28493111) 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, 138216 + ... + 138421.

It is an arithmetic number, because the mean of its divisors is an integer number (7192588).

Almost surely, 2^28493611 is an apocalyptic number.

28493611 is a deficient number, since it is larger than the sum of its proper divisors (276741).

28493611 is a wasteful number, since it uses less digits than its factorization.

28493611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276740.

The product of its digits is 10368, while the sum is 34.

The square root of 28493611 is about 5337.9407078011. The cubic root of 28493611 is about 305.4329102840.

The spelling of 28493611 in words is "twenty-eight million, four hundred ninety-three thousand, six hundred eleven".