2281778 has 8 divisors (see below), whose sum is σ = 3540780. Its totient is φ = 1101520.

The previous prime is 2281777. The next prime is 2281781. The reversal of 2281778 is 8771822.

It can be written as a sum of positive squares in 2 ways, for example, as 2111209 + 170569 = 1453^2 + 413^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2281771) 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, 19613 + ... + 19728.

2^2281778 is an apocalyptic number.

2281778 is a deficient number, since it is larger than the sum of its proper divisors (1259002).

2281778 is a wasteful number, since it uses less digits than its factorization.

2281778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39372.

The product of its digits is 12544, while the sum is 35.

The square root of 2281778 is about 1510.5555269503. Note that the first 4 decimals coincide. The cubic root of 2281778 is about 131.6510911092.

The spelling of 2281778 in words is "two million, two hundred eighty-one thousand, seven hundred seventy-eight".