64543986 has 32 divisors (see below), whose sum is σ = 154465920. Its totient is φ = 19859472.

The previous prime is 64543979. The next prime is 64543991. The reversal of 64543986 is 68934546.

It is a super-2 number, since 2×64543986² = 8331852257536392, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45270 + ... + 46673.

It is an arithmetic number, because the mean of its divisors is an integer number (4827060).

Almost surely, 2^64543986 is an apocalyptic number.

64543986 is an abundant number, since it is smaller than the sum of its proper divisors (89921934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64543986 is a wasteful number, since it uses less digits than its factorization.

64543986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91967 (or 91961 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 64543986 is about 8033.9271841360. The cubic root of 64543986 is about 401.1301082979.

It can be divided in two parts, 6454 and 3986, that added together give a triangular number (10440 = T₁₄₄).

The spelling of 64543986 in words is "sixty-four million, five hundred forty-three thousand, nine hundred eighty-six".