64378305 has 24 divisors (see below), whose sum is σ = 113698728. Its totient is φ = 33686016.

The previous prime is 64378283. The next prime is 64378313. The reversal of 64378305 is 50387346.

It is a happy number.

64378305 is a `hidden beast` number, since 643 + 7 + 8 + 3 + 0 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1461681 + 62916624 = 1209^2 + 7932^2 .

It is not a de Polignac number, because 64378305 - 2⁷ = 64378177 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 64378305.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11112 + ... + 15881.

It is an arithmetic number, because the mean of its divisors is an integer number (4737447).

Almost surely, 2^64378305 is an apocalyptic number.

It is an amenable number.

64378305 is a deficient number, since it is larger than the sum of its proper divisors (49320423).

64378305 is a wasteful number, since it uses less digits than its factorization.

64378305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27057 (or 27054 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 64378305 is about 8023.6092252801. The cubic root of 64378305 is about 400.7865876026.

The spelling of 64378305 in words is "sixty-four million, three hundred seventy-eight thousand, three hundred five".