64939807 has 4 divisors (see below), whose sum is σ = 66004456. Its totient is φ = 63875160.

The previous prime is 64939801. The next prime is 64939811. The reversal of 64939807 is 70893946.

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 64939807 - 2¹⁵ = 64907039 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 (64939801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 532233 + ... + 532354.

It is an arithmetic number, because the mean of its divisors is an integer number (16501114).

Almost surely, 2^64939807 is an apocalyptic number.

64939807 is a deficient number, since it is larger than the sum of its proper divisors (1064649).

64939807 is a wasteful number, since it uses less digits than its factorization.

64939807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1064648.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 64939807 is about 8058.5238722734. The cubic root of 64939807 is about 401.9484249404.

The spelling of 64939807 in words is "sixty-four million, nine hundred thirty-nine thousand, eight hundred seven".