64509378 has 16 divisors (see below), whose sum is σ = 130005216. Its totient is φ = 21338720.

The previous prime is 64509377. The next prime is 64509383. The reversal of 64509378 is 87390546.

It is a happy number.

64509378 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×64509378² = 8322919699893768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64509371) 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 7 ways as a sum of consecutive naturals, for example, 40251 + ... + 41822.

It is an arithmetic number, because the mean of its divisors is an integer number (8125326).

Almost surely, 2^64509378 is an apocalyptic number.

64509378 is an abundant number, since it is smaller than the sum of its proper divisors (65495838).

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

64509378 is a wasteful number, since it uses less digits than its factorization.

64509378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82209.

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 64509378 is about 8031.7730296616. The cubic root of 64509378 is about 401.0584011640.

The spelling of 64509378 in words is "sixty-four million, five hundred nine thousand, three hundred seventy-eight".