64543731 has 24 divisors (see below), whose sum is σ = 102446784. Its totient is φ = 36020880.

The previous prime is 64543729. The next prime is 64543769. The reversal of 64543731 is 13734546.

It is not a de Polignac number, because 64543731 - 2¹ = 64543729 is a prime.

It is a super-2 number, since 2×64543731² = 8331786422800722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64543692 and 64543701.

It is not an unprimeable number, because it can be changed into a prime (64543231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1216 + ... + 11426.

It is an arithmetic number, because the mean of its divisors is an integer number (4268616).

Almost surely, 2^64543731 is an apocalyptic number.

64543731 is a deficient number, since it is larger than the sum of its proper divisors (37903053).

64543731 is a wasteful number, since it uses less digits than its factorization.

64543731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10271 (or 10264 counting only the distinct ones).

The product of its digits is 30240, while the sum is 33.

The square root of 64543731 is about 8033.9113139242. The cubic root of 64543731 is about 401.1295800363.

The spelling of 64543731 in words is "sixty-four million, five hundred forty-three thousand, seven hundred thirty-one".