64378916 has 24 divisors (see below), whose sum is σ = 135535680. Its totient is φ = 26138592.

The previous prime is 64378913. The next prime is 64378939. The reversal of 64378916 is 61987346.

It is not an unprimeable number, because it can be changed into a prime (64378913) 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, 59975 + ... + 61038.

It is an arithmetic number, because the mean of its divisors is an integer number (5647320).

Almost surely, 2^64378916 is an apocalyptic number.

It is an amenable number.

64378916 is an abundant number, since it is smaller than the sum of its proper divisors (71156764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64378916 is a wasteful number, since it uses less digits than its factorization.

64378916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121043 (or 121041 counting only the distinct ones).

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

The square root of 64378916 is about 8023.6473003242. The cubic root of 64378916 is about 400.7878555237.

The spelling of 64378916 in words is "sixty-four million, three hundred seventy-eight thousand, nine hundred sixteen".