57020661 has 24 divisors (see below), whose sum is σ = 83935800. Its totient is φ = 37296000.

The previous prime is 57020659. The next prime is 57020671. The reversal of 57020661 is 16602075.

57020661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 680625 + 56340036 = 825^2 + 7506^2 .

It is not a de Polignac number, because 57020661 - 2¹ = 57020659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57020671) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 135231 + ... + 135651.

It is an arithmetic number, because the mean of its divisors is an integer number (3497325).

Almost surely, 2^57020661 is an apocalyptic number.

It is an amenable number.

57020661 is a deficient number, since it is larger than the sum of its proper divisors (26915139).

57020661 is a wasteful number, since it uses less digits than its factorization.

57020661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677 (or 674 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 57020661 is about 7551.2026194508. The cubic root of 57020661 is about 384.8966068567.

The spelling of 57020661 in words is "fifty-seven million, twenty thousand, six hundred sixty-one".