64641305 has 4 divisors (see below), whose sum is σ = 77569572. Its totient is φ = 51713040.

The previous prime is 64641301. The next prime is 64641307. The reversal of 64641305 is 50314646.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50314646 = 2 ⋅25157323.

It can be written as a sum of positive squares in 2 ways, for example, as 25240576 + 39400729 = 5024^2 + 6277^2 .

It is not a de Polignac number, because 64641305 - 2² = 64641301 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64641301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6464126 + ... + 6464135.

It is an arithmetic number, because the mean of its divisors is an integer number (19392393).

Almost surely, 2^64641305 is an apocalyptic number.

It is an amenable number.

64641305 is a deficient number, since it is larger than the sum of its proper divisors (12928267).

64641305 is a wasteful number, since it uses less digits than its factorization.

64641305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12928266.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 64641305 is about 8039.9816542079. The cubic root of 64641305 is about 401.3316141734.

It can be divided in two parts, 64641 and 305, that added together give a palindrome (64946).

The spelling of 64641305 in words is "sixty-four million, six hundred forty-one thousand, three hundred five".