64778622 has 8 divisors (see below), whose sum is σ = 129557256. Its totient is φ = 21592872.

The previous prime is 64778621. The next prime is 64778627. The reversal of 64778622 is 22687746.

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

64778622 is an admirable number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64778621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5398213 + ... + 5398224.

It is an arithmetic number, because the mean of its divisors is an integer number (16194657).

Almost surely, 2^64778622 is an apocalyptic number.

64778622 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

64778622 is a wasteful number, since it uses less digits than its factorization.

64778622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10796442.

The product of its digits is 225792, while the sum is 42.

The square root of 64778622 is about 8048.5167577635. The cubic root of 64778622 is about 401.6155950133.

The spelling of 64778622 in words is "sixty-four million, seven hundred seventy-eight thousand, six hundred twenty-two".