2288781 has 24 divisors (see below), whose sum is σ = 3675360. Its totient is φ = 1360800.

The previous prime is 2288773. The next prime is 2288801. The reversal of 2288781 is 1878822.

2288781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2288781 - 2³ = 2288773 is a prime.

It is a super-2 number, since 2×2288781² = 10477036931922, which contains 22 as substring.

2288781 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2288711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5850 + ... + 6228.

It is an arithmetic number, because the mean of its divisors is an integer number (153140).

2^2288781 is an apocalyptic number.

It is an amenable number.

2288781 is a deficient number, since it is larger than the sum of its proper divisors (1386579).

2288781 is a wasteful number, since it uses less digits than its factorization.

2288781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457 (or 454 counting only the distinct ones).

The product of its digits is 14336, while the sum is 36.

The square root of 2288781 is about 1512.8717724910. The cubic root of 2288781 is about 131.7856369193.

It can be divided in two parts, 228 and 8781, that added together give a palindrome (9009).

The spelling of 2288781 in words is "two million, two hundred eighty-eight thousand, seven hundred eighty-one".