57042247 has 4 divisors (see below), whose sum is σ = 57477816. Its totient is φ = 56606680.

The previous prime is 57042239. The next prime is 57042253. The reversal of 57042247 is 74224075.

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

It is a cyclic number.

It is not a de Polignac number, because 57042247 - 2³ = 57042239 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57042347) 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, 217588 + ... + 217849.

It is an arithmetic number, because the mean of its divisors is an integer number (14369454).

Almost surely, 2^57042247 is an apocalyptic number.

57042247 is a deficient number, since it is larger than the sum of its proper divisors (435569).

57042247 is a wasteful number, since it uses less digits than its factorization.

57042247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435568.

The product of its (nonzero) digits is 15680, while the sum is 31.

The square root of 57042247 is about 7552.6317929580. The cubic root of 57042247 is about 384.9451701307.

The spelling of 57042247 in words is "fifty-seven million, forty-two thousand, two hundred forty-seven".