57781836 has 120 divisors (see below), whose sum is σ = 175498400. Its totient is φ = 16236288.

The previous prime is 57781817. The next prime is 57781837. The reversal of 57781836 is 63818775.

It is a junction number, because it is equal to n+sod(n) for n = 57781791 and 57781800.

It is not an unprimeable number, because it can be changed into a prime (57781837) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 165390 + ... + 165738.

Almost surely, 2^57781836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 57781836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87749200).

57781836 is an abundant number, since it is smaller than the sum of its proper divisors (117716564).

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

57781836 is a wasteful number, since it uses less digits than its factorization.

57781836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445 (or 434 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 57781836 is about 7601.4364431994. The cubic root of 57781836 is about 386.6017175227.

The spelling of 57781836 in words is "fifty-seven million, seven hundred eighty-one thousand, eight hundred thirty-six".