64393643 has 4 divisors (see below), whose sum is σ = 65018928. Its totient is φ = 63768360.

The previous prime is 64393627. The next prime is 64393649. The reversal of 64393643 is 34639346.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64393643 - 2⁴ = 64393627 is a prime.

It is a super-2 number, since 2×64393643² = 8293082517622898, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64393597 and 64393606.

It is not an unprimeable number, because it can be changed into a prime (64393649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 312488 + ... + 312693.

It is an arithmetic number, because the mean of its divisors is an integer number (16254732).

Almost surely, 2^64393643 is an apocalyptic number.

64393643 is a deficient number, since it is larger than the sum of its proper divisors (625285).

64393643 is a wasteful number, since it uses less digits than its factorization.

64393643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625284.

The product of its digits is 139968, while the sum is 38.

The square root of 64393643 is about 8024.5649726325. The cubic root of 64393643 is about 400.8184139379.

The spelling of 64393643 in words is "sixty-four million, three hundred ninety-three thousand, six hundred forty-three".