57453721 has 4 divisors (see below), whose sum is σ = 61873252. Its totient is φ = 53034192.

The previous prime is 57453707. The next prime is 57453731. The reversal of 57453721 is 12735475.

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 32901696 + 24552025 = 5736^2 + 4955^2 .

It is a cyclic number.

It is not a de Polignac number, because 57453721 - 2¹⁷ = 57322649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57453731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2209746 + ... + 2209771.

It is an arithmetic number, because the mean of its divisors is an integer number (15468313).

Almost surely, 2^57453721 is an apocalyptic number.

It is an amenable number.

57453721 is a deficient number, since it is larger than the sum of its proper divisors (4419531).

57453721 is a wasteful number, since it uses less digits than its factorization.

57453721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4419530.

The product of its digits is 29400, while the sum is 34.

The square root of 57453721 is about 7579.8232829005. The cubic root of 57453721 is about 385.8685535051.

The spelling of 57453721 in words is "fifty-seven million, four hundred fifty-three thousand, seven hundred twenty-one".