64278786 has 64 divisors (see below), whose sum is σ = 159022080. Its totient is φ = 17029440.

The previous prime is 64278757. The next prime is 64278787. The reversal of 64278786 is 68787246.

It is not an unprimeable number, because it can be changed into a prime (64278787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14331 + ... + 18273.

It is an arithmetic number, because the mean of its divisors is an integer number (2484720).

Almost surely, 2^64278786 is an apocalyptic number.

64278786 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 64278786, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79511040).

64278786 is an abundant number, since it is smaller than the sum of its proper divisors (94743294).

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

64278786 is a wasteful number, since it uses less digits than its factorization.

64278786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3991.

The product of its digits is 903168, while the sum is 48.

The square root of 64278786 is about 8017.4051912074. The cubic root of 64278786 is about 400.5799628679.

The spelling of 64278786 in words is "sixty-four million, two hundred seventy-eight thousand, seven hundred eighty-six".