64543871 has 8 divisors (see below), whose sum is σ = 74653824. Its totient is φ = 54656280.

The previous prime is 64543867. The next prime is 64543889. The reversal of 64543871 is 17834546.

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

It is not a de Polignac number, because 64543871 - 2² = 64543867 is a prime.

It is a super-2 number, since 2×64543871² = 8331822567329282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64543841) 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, 54965 + ... + 56126.

It is an arithmetic number, because the mean of its divisors is an integer number (9331728).

Almost surely, 2^64543871 is an apocalyptic number.

64543871 is a deficient number, since it is larger than the sum of its proper divisors (10109953).

64543871 is a wasteful number, since it uses less digits than its factorization.

64543871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111181.

The product of its digits is 80640, while the sum is 38.

The square root of 64543871 is about 8033.9200269856. The cubic root of 64543871 is about 401.1298700624.

The spelling of 64543871 in words is "sixty-four million, five hundred forty-three thousand, eight hundred seventy-one".