64381967 has 8 divisors (see below), whose sum is σ = 69643056. Its totient is φ = 59164992.

The previous prime is 64381957. The next prime is 64381969. The reversal of 64381967 is 76918346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64381967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64381969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7958 + ... + 13859.

It is an arithmetic number, because the mean of its divisors is an integer number (8705382).

Almost surely, 2^64381967 is an apocalyptic number.

64381967 is a deficient number, since it is larger than the sum of its proper divisors (5261089).

64381967 is a wasteful number, since it uses less digits than its factorization.

64381967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22057.

The product of its digits is 217728, while the sum is 44.

The square root of 64381967 is about 8023.8374235773. The cubic root of 64381967 is about 400.7941867084.

The spelling of 64381967 in words is "sixty-four million, three hundred eighty-one thousand, nine hundred sixty-seven".