64399066 has 4 divisors (see below), whose sum is σ = 96598602. Its totient is φ = 32199532.

The previous prime is 64399063. The next prime is 64399087. The reversal of 64399066 is 66099346.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66099346 = 2 ⋅33049673.

It can be written as a sum of positive squares in only one way, i.e., 58293225 + 6105841 = 7635^2 + 2471^2 .

It is not an unprimeable number, because it can be changed into a prime (64399061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16099765 + ... + 16099768.

Almost surely, 2^64399066 is an apocalyptic number.

64399066 is a deficient number, since it is larger than the sum of its proper divisors (32199536).

64399066 is a wasteful number, since it uses less digits than its factorization.

64399066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32199535.

The product of its (nonzero) digits is 209952, while the sum is 43.

The square root of 64399066 is about 8024.9028654558. The cubic root of 64399066 is about 400.8296654483.

The spelling of 64399066 in words is "sixty-four million, three hundred ninety-nine thousand, sixty-six".