64939771 has 6 divisors (see below), whose sum is σ = 70319580. Its totient is φ = 59944248.

The previous prime is 64939769. The next prime is 64939783. The reversal of 64939771 is 17793946.

It is not a de Polignac number, because 64939771 - 2¹ = 64939769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64939751) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 191961 + ... + 192298.

It is an arithmetic number, because the mean of its divisors is an integer number (11719930).

Almost surely, 2^64939771 is an apocalyptic number.

64939771 is a deficient number, since it is larger than the sum of its proper divisors (5379809).

64939771 is a wasteful number, since it uses less digits than its factorization.

64939771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384285 (or 384272 counting only the distinct ones).

The product of its digits is 285768, while the sum is 46.

The square root of 64939771 is about 8058.5216386134. The cubic root of 64939771 is about 401.9483506657.

The spelling of 64939771 in words is "sixty-four million, nine hundred thirty-nine thousand, seven hundred seventy-one".