57643866 has 64 divisors (see below), whose sum is σ = 148473600. Its totient is φ = 16236288.

The previous prime is 57643823. The next prime is 57643867. The reversal of 57643866 is 66834675.

57643866 = T₁₉₆ + T₁₉₇ + ... + T₇₀₆.

It is not an unprimeable number, because it can be changed into a prime (57643867) 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, 26550 + ... + 28638.

It is an arithmetic number, because the mean of its divisors is an integer number (2319900).

Almost surely, 2^57643866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 57643866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74236800).

57643866 is an abundant number, since it is smaller than the sum of its proper divisors (90829734).

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

57643866 is a wasteful number, since it uses less digits than its factorization.

57643866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2180 (or 2174 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The square root of 57643866 is about 7592.3557608953. The cubic root of 57643866 is about 386.2937663668.

The spelling of 57643866 in words is "fifty-seven million, six hundred forty-three thousand, eight hundred sixty-six".