64427778 has 16 divisors (see below), whose sum is σ = 143172960. Its totient is φ = 21475908.

The previous prime is 64427747. The next prime is 64427789. The reversal of 64427778 is 87772446.

64427778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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, 596500 + ... + 596607.

It is an arithmetic number, because the mean of its divisors is an integer number (8948310).

Almost surely, 2^64427778 is an apocalyptic number.

64427778 is an abundant number, since it is smaller than the sum of its proper divisors (78745182).

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

64427778 is a wasteful number, since it uses less digits than its factorization.

64427778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1193118 (or 1193112 counting only the distinct ones).

The product of its digits is 526848, while the sum is 45.

The square root of 64427778 is about 8026.6915974142. The cubic root of 64427778 is about 400.8892258951.

The spelling of 64427778 in words is "sixty-four million, four hundred twenty-seven thousand, seven hundred seventy-eight".