2578705 has 4 divisors (see below), whose sum is σ = 3094452. Its totient is φ = 2062960.

The previous prime is 2578657. The next prime is 2578717. The reversal of 2578705 is 5078752.

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 707281 + 1871424 = 841^2 + 1368^2 .

It is not a de Polignac number, because 2578705 - 2¹⁷ = 2447633 is a prime.

It is a Duffinian number.

2578705 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 257866 + ... + 257875.

It is an arithmetic number, because the mean of its divisors is an integer number (773613).

2^2578705 is an apocalyptic number.

It is an amenable number.

2578705 is a deficient number, since it is larger than the sum of its proper divisors (515747).

2578705 is an equidigital number, since it uses as much as digits as its factorization.

2578705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515746.

The product of its (nonzero) digits is 19600, while the sum is 34.

The square root of 2578705 is about 1605.8346739313. The cubic root of 2578705 is about 137.1304456671.

The spelling of 2578705 in words is "two million, five hundred seventy-eight thousand, seven hundred five".