57146721 has 16 divisors (see below), whose sum is σ = 77103360. Its totient is φ = 37647360.

The previous prime is 57146681. The next prime is 57146753. The reversal of 57146721 is 12764175.

It is not a de Polignac number, because 57146721 - 2⁹ = 57146209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (57146321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132376 + ... + 132806.

It is an arithmetic number, because the mean of its divisors is an integer number (4818960).

Almost surely, 2^57146721 is an apocalyptic number.

It is an amenable number.

57146721 is a deficient number, since it is larger than the sum of its proper divisors (19956639).

57146721 is a wasteful number, since it uses less digits than its factorization.

57146721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 856.

The product of its digits is 11760, while the sum is 33.

The square root of 57146721 is about 7559.5450259920. The cubic root of 57146721 is about 385.1800383566.

The spelling of 57146721 in words is "fifty-seven million, one hundred forty-six thousand, seven hundred twenty-one".