2645778 has 16 divisors (see below), whose sum is σ = 5603040. Its totient is φ = 830016.

The previous prime is 2645777. The next prime is 2645779. The reversal of 2645778 is 8775462.

It is an interprime number because it is at equal distance from previous prime (2645777) and next prime (2645779).

It is not an unprimeable number, because it can be changed into a prime (2645777) 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, 12868 + ... + 13071.

It is an arithmetic number, because the mean of its divisors is an integer number (350190).

2^2645778 is an apocalyptic number.

2645778 is an abundant number, since it is smaller than the sum of its proper divisors (2957262).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2645778 is a wasteful number, since it uses less digits than its factorization.

2645778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25961.

The product of its digits is 94080, while the sum is 39.

The square root of 2645778 is about 1626.5847656977. The cubic root of 2645778 is about 138.3092204871.

The spelling of 2645778 in words is "two million, six hundred forty-five thousand, seven hundred seventy-eight".