64681378 has 8 divisors (see below), whose sum is σ = 97218000. Its totient is φ = 32275380.

The previous prime is 64681367. The next prime is 64681403. The reversal of 64681378 is 87318646.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31408 + ... + 33403.

It is an arithmetic number, because the mean of its divisors is an integer number (12152250).

Almost surely, 2^64681378 is an apocalyptic number.

64681378 is a deficient number, since it is larger than the sum of its proper divisors (32536622).

64681378 is a wasteful number, since it uses less digits than its factorization.

64681378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65312.

The product of its digits is 193536, while the sum is 43.

The square root of 64681378 is about 8042.4733757719. The cubic root of 64681378 is about 401.4145293701.

The spelling of 64681378 in words is "sixty-four million, six hundred eighty-one thousand, three hundred seventy-eight".