57216500 has 96 divisors (see below), whose sum is σ = 139007232. Its totient is φ = 20400000.

The previous prime is 57216499. The next prime is 57216503. The reversal of 57216500 is 561275.

It is a self number, because there is not a number n which added to its sum of digits gives 57216500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57216503) 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, 555449 + ... + 555551.

It is an arithmetic number, because the mean of its divisors is an integer number (1447992).

Almost surely, 2^57216500 is an apocalyptic number.

57216500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 57216500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69503616).

57216500 is an abundant number, since it is smaller than the sum of its proper divisors (81790732).

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

57216500 is a wasteful number, since it uses less digits than its factorization.

57216500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234 (or 222 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 57216500 is about 7564.1589089601. The cubic root of 57216500 is about 385.3367492769.

Adding to 57216500 its reverse (561275), we get a palindrome (57777775).

It can be divided in two parts, 5721 and 6500, that added together give a palindrome (12221).

The spelling of 57216500 in words is "fifty-seven million, two hundred sixteen thousand, five hundred".