64578545 has 4 divisors (see below), whose sum is σ = 77494260. Its totient is φ = 51662832.

The previous prime is 64578533. The next prime is 64578551. The reversal of 64578545 is 54587546.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40056241 + 24522304 = 6329^2 + 4952^2 .

It is a cyclic number.

It is not a de Polignac number, because 64578545 - 2²⁴ = 47801329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64578496 and 64578505.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6457850 + ... + 6457859.

It is an arithmetic number, because the mean of its divisors is an integer number (19373565).

Almost surely, 2^64578545 is an apocalyptic number.

It is an amenable number.

64578545 is a deficient number, since it is larger than the sum of its proper divisors (12915715).

64578545 is a wasteful number, since it uses less digits than its factorization.

64578545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12915714.

The product of its digits is 672000, while the sum is 44.

The square root of 64578545 is about 8036.0777124167. The cubic root of 64578545 is about 401.2016883310.

Subtracting from 64578545 its reverse (54587546), we obtain a palindrome (9990999).

The spelling of 64578545 in words is "sixty-four million, five hundred seventy-eight thousand, five hundred forty-five".