2078645 has 4 divisors (see below), whose sum is σ = 2494380. Its totient is φ = 1662912.

The previous prime is 2078627. The next prime is 2078647. The reversal of 2078645 is 5468702.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1129969 + 948676 = 1063^2 + 974^2 .

It is a cyclic number.

It is not a de Polignac number, because 2078645 - 2⁸ = 2078389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2078647) 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, 207860 + ... + 207869.

It is an arithmetic number, because the mean of its divisors is an integer number (623595).

2^2078645 is an apocalyptic number.

It is an amenable number.

2078645 is a deficient number, since it is larger than the sum of its proper divisors (415735).

2078645 is an equidigital number, since it uses as much as digits as its factorization.

2078645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415734.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 2078645 is about 1441.7506719263. The cubic root of 2078645 is about 127.6223610671.

The spelling of 2078645 in words is "two million, seventy-eight thousand, six hundred forty-five".