57071247 has 8 divisors (see below), whose sum is σ = 76268544. Its totient is φ = 37960728.

The previous prime is 57071243. The next prime is 57071251. The reversal of 57071247 is 74217075.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (57071243) and next prime (57071251).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 57071247 - 2² = 57071243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57071243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20143 + ... + 22800.

It is an arithmetic number, because the mean of its divisors is an integer number (9533568).

Almost surely, 2^57071247 is an apocalyptic number.

57071247 is a deficient number, since it is larger than the sum of its proper divisors (19197297).

57071247 is a wasteful number, since it uses less digits than its factorization.

57071247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43389.

The product of its (nonzero) digits is 13720, while the sum is 33.

The square root of 57071247 is about 7554.5514095808. The cubic root of 57071247 is about 385.0103938275.

It can be divided in two parts, 5707124 and 7, that added together give a triangular number (5707131 = T₃₃₇₈).

The spelling of 57071247 in words is "fifty-seven million, seventy-one thousand, two hundred forty-seven".