57109212 has 60 divisors (see below), whose sum is σ = 157169320. Its totient is φ = 18032544.

The previous prime is 57109211. The next prime is 57109267. The reversal of 57109212 is 21290175.

57109212 is a `hidden beast` number, since 571 + 0 + 92 + 1 + 2 = 666.

It is a super-2 number, since 2×57109212² = 6522924190521888, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57109211) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1518 + ... + 10794.

Almost surely, 2^57109212 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 57109212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78584660).

57109212 is an abundant number, since it is smaller than the sum of its proper divisors (100060108).

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

57109212 is a wasteful number, since it uses less digits than its factorization.

57109212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9312 (or 9301 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 57109212 is about 7557.0637154916. The cubic root of 57109212 is about 385.0957472550.

Adding to 57109212 its reverse (21290175), we get a palindrome (78399387).

The spelling of 57109212 in words is "fifty-seven million, one hundred nine thousand, two hundred twelve".