64549143 has 20 divisors (see below), whose sum is σ = 96679000. Its totient is φ = 42919632.

The previous prime is 64549139. The next prime is 64549169. The reversal of 64549143 is 34194546.

64549143 is a `hidden beast` number, since 645 + 4 + 9 + 1 + 4 + 3 = 666.

It is not a de Polignac number, because 64549143 - 2² = 64549139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64549098 and 64549107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64549123) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 39621 + ... + 41217.

It is an arithmetic number, because the mean of its divisors is an integer number (4833950).

Almost surely, 2^64549143 is an apocalyptic number.

64549143 is a deficient number, since it is larger than the sum of its proper divisors (32129857).

64549143 is a wasteful number, since it uses less digits than its factorization.

64549143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2108 (or 2099 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 64549143 is about 8034.2481291033. The cubic root of 64549143 is about 401.1407913116.

The spelling of 64549143 in words is "sixty-four million, five hundred forty-nine thousand, one hundred forty-three".