2278787 has 4 divisors (see below), whose sum is σ = 2604336. Its totient is φ = 1953240.

The previous prime is 2278769. The next prime is 2278807. The reversal of 2278787 is 7878722.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7878722 = 2 ⋅3939361.

It is a cyclic number.

It is not a de Polignac number, because 2278787 - 2¹² = 2274691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2278747) 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, 162764 + ... + 162777.

It is an arithmetic number, because the mean of its divisors is an integer number (651084).

2^2278787 is an apocalyptic number.

2278787 is a deficient number, since it is larger than the sum of its proper divisors (325549).

2278787 is an equidigital number, since it uses as much as digits as its factorization.

2278787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325548.

The product of its digits is 87808, while the sum is 41.

The square root of 2278787 is about 1509.5651691795. The cubic root of 2278787 is about 131.5935423333.

The spelling of 2278787 in words is "two million, two hundred seventy-eight thousand, seven hundred eighty-seven".