28111701 has 8 divisors (see below), whose sum is σ = 38774880. Its totient is φ = 18094832.

The previous prime is 28111679. The next prime is 28111709. The reversal of 28111701 is 10711182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28111701 - 2¹⁴ = 28095317 is a prime.

It is a super-2 number, since 2×28111701² = 1580535466226802, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28111709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161475 + ... + 161648.

It is an arithmetic number, because the mean of its divisors is an integer number (4846860).

Almost surely, 2^28111701 is an apocalyptic number.

It is an amenable number.

28111701 is a deficient number, since it is larger than the sum of its proper divisors (10663179).

28111701 is a wasteful number, since it uses less digits than its factorization.

28111701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323155.

The product of its (nonzero) digits is 112, while the sum is 21.

The square root of 28111701 is about 5302.0468688988. The cubic root of 28111701 is about 304.0621590634.

Adding to 28111701 its reverse (10711182), we get a palindrome (38822883).

The spelling of 28111701 in words is "twenty-eight million, one hundred eleven thousand, seven hundred one".