64312643 has 4 divisors (see below), whose sum is σ = 64515840. Its totient is φ = 64109448.

The previous prime is 64312639. The next prime is 64312657. The reversal of 64312643 is 34621346.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34621346 = 2 ⋅17310673.

It is a cyclic number.

It is not a de Polignac number, because 64312643 - 2² = 64312639 is a prime.

It is a super-2 number, since 2×64312643² = 8272232099290898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64312603) 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, 101123 + ... + 101756.

It is an arithmetic number, because the mean of its divisors is an integer number (16128960).

Almost surely, 2^64312643 is an apocalyptic number.

64312643 is a deficient number, since it is larger than the sum of its proper divisors (203197).

64312643 is a wasteful number, since it uses less digits than its factorization.

64312643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203196.

The product of its digits is 10368, while the sum is 29.

The square root of 64312643 is about 8019.5163819273. The cubic root of 64312643 is about 400.6502818443.

Adding to 64312643 its reverse (34621346), we get a palindrome (98933989).

The spelling of 64312643 in words is "sixty-four million, three hundred twelve thousand, six hundred forty-three".