2086578 has 48 divisors (see below), whose sum is σ = 5021016. Its totient is φ = 622080.

The previous prime is 2086577. The next prime is 2086589. The reversal of 2086578 is 8756802.

2086578 is a `hidden beast` number, since 2 + 0 + 86 + 578 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1979649 + 106929 = 1407^2 + 327^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2086571) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8538 + ... + 8778.

2^2086578 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2086578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2510508).

2086578 is an abundant number, since it is smaller than the sum of its proper divisors (2934438).

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

2086578 is a wasteful number, since it uses less digits than its factorization.

2086578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299 (or 296 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 2086578 is about 1444.4992211836. The cubic root of 2086578 is about 127.7845088382.

It can be divided in two parts, 208 and 6578, that added together give a triangular number (6786 = T₁₁₆).

The spelling of 2086578 in words is "two million, eighty-six thousand, five hundred seventy-eight".