2057778 has 32 divisors (see below), whose sum is σ = 4665600. Its totient is φ = 672048.

The previous prime is 2057777. The next prime is 2057779. The reversal of 2057778 is 8777502.

It is an interprime number because it is at equal distance from previous prime (2057777) and next prime (2057779).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (2057777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2503 + ... + 3221.

It is an arithmetic number, because the mean of its divisors is an integer number (145800).

2^2057778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2057778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2332800).

2057778 is an abundant number, since it is smaller than the sum of its proper divisors (2607822).

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

2057778 is a wasteful number, since it uses less digits than its factorization.

2057778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783 (or 777 counting only the distinct ones).

The product of its (nonzero) digits is 27440, while the sum is 36.

The square root of 2057778 is about 1434.4957302132. The cubic root of 2057778 is about 127.1938676289.

The spelling of 2057778 in words is "two million, fifty-seven thousand, seven hundred seventy-eight".