57061720 has 16 divisors (see below), whose sum is σ = 128388960. Its totient is φ = 22824672.

The previous prime is 57061717. The next prime is 57061747. The reversal of 57061720 is 2716075.

57061720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 713232 + ... + 713311.

It is an arithmetic number, because the mean of its divisors is an integer number (8024310).

Almost surely, 2^57061720 is an apocalyptic number.

It is an amenable number.

57061720 is an abundant number, since it is smaller than the sum of its proper divisors (71327240).

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

57061720 is a wasteful number, since it uses less digits than its factorization.

57061720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1426554 (or 1426550 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 57061720 is about 7553.9208362280. The cubic root of 57061720 is about 384.9889691560.

Adding to 57061720 its reverse (2716075), we get a palindrome (59777795).

The spelling of 57061720 in words is "fifty-seven million, sixty-one thousand, seven hundred twenty".