64378045 has 8 divisors (see below), whose sum is σ = 77655096. Its totient is φ = 51234816.

The previous prime is 64378003. The next prime is 64378049. The reversal of 64378045 is 54087346.

It can be written as a sum of positive squares in 4 ways, for example, as 8696601 + 55681444 = 2949^2 + 7462^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64378045 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64377995 and 64378013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64378049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32392 + ... + 34321.

It is an arithmetic number, because the mean of its divisors is an integer number (9706887).

Almost surely, 2^64378045 is an apocalyptic number.

It is an amenable number.

64378045 is a deficient number, since it is larger than the sum of its proper divisors (13277051).

64378045 is a wasteful number, since it uses less digits than its factorization.

64378045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66911.

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 64378045 is about 8023.5930230789. The cubic root of 64378045 is about 400.7860480593.

The spelling of 64378045 in words is "sixty-four million, three hundred seventy-eight thousand, forty-five".