64661306 has 4 divisors (see below), whose sum is σ = 96991962. Its totient is φ = 32330652.

The previous prime is 64661299. The next prime is 64661309. The reversal of 64661306 is 60316646.

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

It can be written as a sum of positive squares in only one way, i.e., 40208281 + 24453025 = 6341^2 + 4945^2 .

It is not an unprimeable number, because it can be changed into a prime (64661309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16165325 + ... + 16165328.

Almost surely, 2^64661306 is an apocalyptic number.

64661306 is a deficient number, since it is larger than the sum of its proper divisors (32330656).

64661306 is a wasteful number, since it uses less digits than its factorization.

64661306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32330655.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 64661306 is about 8041.2254041284. The cubic root of 64661306 is about 401.3730026007.

The spelling of 64661306 in words is "sixty-four million, six hundred sixty-one thousand, three hundred six".