2578013 has 4 divisors (see below), whose sum is σ = 2666940. Its totient is φ = 2489088.

The previous prime is 2578003. The next prime is 2578019. The reversal of 2578013 is 3108752.

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 840889 + 1737124 = 917^2 + 1318^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2578013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2578019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44420 + ... + 44477.

It is an arithmetic number, because the mean of its divisors is an integer number (666735).

2^2578013 is an apocalyptic number.

It is an amenable number.

2578013 is a deficient number, since it is larger than the sum of its proper divisors (88927).

2578013 is an equidigital number, since it uses as much as digits as its factorization.

2578013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88926.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 2578013 is about 1605.6191952017. The cubic root of 2578013 is about 137.1181781713.

The spelling of 2578013 in words is "two million, five hundred seventy-eight thousand, thirteen".