57101720 has 48 divisors (see below), whose sum is σ = 139138560. Its totient is φ = 21081216.

The previous prime is 57101689. The next prime is 57101731. The reversal of 57101720 is 2710175.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2537 + ... + 10983.

It is an arithmetic number, because the mean of its divisors is an integer number (2898720).

Almost surely, 2^57101720 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 57101720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69569280).

57101720 is an abundant number, since it is smaller than the sum of its proper divisors (82036840).

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

57101720 is a wasteful number, since it uses less digits than its factorization.

57101720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8484 (or 8467 counting only the distinct ones).

The product of its (nonzero) digits is 490, while the sum is 23.

The square root of 57101720 is about 7556.5680040611. The cubic root of 57101720 is about 385.0789066356.

Adding to 57101720 its reverse (2710175), we get a palindrome (59811895).

The spelling of 57101720 in words is "fifty-seven million, one hundred one thousand, seven hundred twenty".