1057819686 has 64 divisors (see below), whose sum is σ = 2687510016. Its totient is φ = 269568000.

The previous prime is 1057819681. The next prime is 1057819687. The reversal of 1057819686 is 6869187501.

It is a super-2 number, since 2×1057819686² = 2237964976178277192, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1057819681) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2886 + ... + 46086.

It is an arithmetic number, because the mean of its divisors is an integer number (41992344).

Almost surely, 2^1057819686 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1057819686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1343755008).

1057819686 is an abundant number, since it is smaller than the sum of its proper divisors (1629690330).

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

1057819686 is a wasteful number, since it uses less digits than its factorization.

1057819686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43277.

The product of its (nonzero) digits is 725760, while the sum is 51.

The square root of 1057819686 is about 32524.1400501228. The cubic root of 1057819686 is about 1018.9132620227.

The spelling of 1057819686 in words is "one billion, fifty-seven million, eight hundred nineteen thousand, six hundred eighty-six".