64378917 has 12 divisors (see below), whose sum is σ = 94169920. Its totient is φ = 42375528.

The previous prime is 64378913. The next prime is 64378939. The reversal of 64378917 is 71987346.

64378917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 64378917 - 2² = 64378913 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 (64378913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44563 + ... + 45984.

Almost surely, 2^64378917 is an apocalyptic number.

It is an amenable number.

64378917 is a deficient number, since it is larger than the sum of its proper divisors (29791003).

64378917 is a wasteful number, since it uses less digits than its factorization.

64378917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90632 (or 90629 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 64378917 is about 8023.6473626400. The cubic root of 64378917 is about 400.7878575988.

The spelling of 64378917 in words is "sixty-four million, three hundred seventy-eight thousand, nine hundred seventeen".