64378843 has 4 divisors (see below), whose sum is σ = 64684168. Its totient is φ = 64073520.

The previous prime is 64378841. The next prime is 64378871. The reversal of 64378843 is 34887346.

It is a happy number.

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 64378843 - 2¹ = 64378841 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64378843.

It is not an unprimeable number, because it can be changed into a prime (64378841) 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, 152346 + ... + 152767.

It is an arithmetic number, because the mean of its divisors is an integer number (16171042).

Almost surely, 2^64378843 is an apocalyptic number.

64378843 is a deficient number, since it is larger than the sum of its proper divisors (305325).

64378843 is a wasteful number, since it uses less digits than its factorization.

64378843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305324.

The product of its digits is 387072, while the sum is 43.

The square root of 64378843 is about 8023.6427512695. The cubic root of 64378843 is about 400.7877040376.

The spelling of 64378843 in words is "sixty-four million, three hundred seventy-eight thousand, eight hundred forty-three".