64013778 has 12 divisors (see below), whose sum is σ = 138696558. Its totient is φ = 21337920.

The previous prime is 64013777. The next prime is 64013783. The reversal of 64013778 is 87731046.

64013778 is a `hidden beast` number, since 640 + 1 + 3 + 7 + 7 + 8 = 666.

64013778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 42419169 + 21594609 = 6513^2 + 4647^2 .

It is not an unprimeable number, because it can be changed into a prime (64013777) 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 5 ways as a sum of consecutive naturals, for example, 1778143 + ... + 1778178.

Almost surely, 2^64013778 is an apocalyptic number.

64013778 is an abundant number, since it is smaller than the sum of its proper divisors (74682780).

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

64013778 is a wasteful number, since it uses less digits than its factorization.

64013778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3556329 (or 3556326 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 64013778 is about 8000.8610786590. The cubic root of 64013778 is about 400.0287021071.

The spelling of 64013778 in words is "sixty-four million, thirteen thousand, seven hundred seventy-eight".