64689799 has 4 divisors (see below), whose sum is σ = 64708336. Its totient is φ = 64671264.

The previous prime is 64689791. The next prime is 64689803. The reversal of 64689799 is 99798646.

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

It is a cyclic number.

It is not a de Polignac number, because 64689799 - 2³ = 64689791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64689791) 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, 2274 + ... + 11599.

It is an arithmetic number, because the mean of its divisors is an integer number (16177084).

Almost surely, 2^64689799 is an apocalyptic number.

64689799 is a deficient number, since it is larger than the sum of its proper divisors (18537).

64689799 is a wasteful number, since it uses less digits than its factorization.

64689799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18536.

The product of its digits is 5878656, while the sum is 58.

The square root of 64689799 is about 8042.9968917065. The cubic root of 64689799 is about 401.4319489386.

The spelling of 64689799 in words is "sixty-four million, six hundred eighty-nine thousand, seven hundred ninety-nine".