57870721 has 4 divisors (see below), whose sum is σ = 59282244. Its totient is φ = 56459200.

The previous prime is 57870719. The next prime is 57870727. The reversal of 57870721 is 12707875.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12173121 + 45697600 = 3489^2 + 6760^2 .

It is a cyclic number.

It is not a de Polignac number, because 57870721 - 2¹ = 57870719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57870727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 705700 + ... + 705781.

It is an arithmetic number, because the mean of its divisors is an integer number (14820561).

Almost surely, 2^57870721 is an apocalyptic number.

It is an amenable number.

57870721 is a deficient number, since it is larger than the sum of its proper divisors (1411523).

57870721 is a wasteful number, since it uses less digits than its factorization.

57870721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1411522.

The product of its (nonzero) digits is 27440, while the sum is 37.

The square root of 57870721 is about 7607.2807888233. The cubic root of 57870721 is about 386.7998506559.

The spelling of 57870721 in words is "fifty-seven million, eight hundred seventy thousand, seven hundred twenty-one".