28117761 has 8 divisors (see below), whose sum is σ = 42846144. Its totient is φ = 16067280.

The previous prime is 28117717. The next prime is 28117769. The reversal of 28117761 is 16771182.

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

It is not a de Polignac number, because 28117761 - 2¹¹ = 28115713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28117769) 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, 669450 + ... + 669491.

It is an arithmetic number, because the mean of its divisors is an integer number (5355768).

Almost surely, 2^28117761 is an apocalyptic number.

28117761 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28117761 is a deficient number, since it is larger than the sum of its proper divisors (14728383).

28117761 is a wasteful number, since it uses less digits than its factorization.

28117761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338951.

The product of its digits is 4704, while the sum is 33.

The square root of 28117761 is about 5302.6183155117. The cubic root of 28117761 is about 304.0840062449.

The spelling of 28117761 in words is "twenty-eight million, one hundred seventeen thousand, seven hundred sixty-one".