64938729 has 24 divisors (see below), whose sum is σ = 92681280. Its totient is φ = 40367712.

The previous prime is 64938721. The next prime is 64938749. The reversal of 64938729 is 92783946.

It is not a de Polignac number, because 64938729 - 2³ = 64938721 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64938721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 127327 + ... + 127835.

It is an arithmetic number, because the mean of its divisors is an integer number (3861720).

Almost surely, 2^64938729 is an apocalyptic number.

64938729 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

It is an amenable number.

64938729 is a deficient number, since it is larger than the sum of its proper divisors (27742551).

64938729 is a wasteful number, since it uses less digits than its factorization.

64938729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621 (or 578 counting only the distinct ones).

The product of its digits is 653184, while the sum is 48.

The square root of 64938729 is about 8058.4569862971. The cubic root of 64938729 is about 401.9462008151.

The spelling of 64938729 in words is "sixty-four million, nine hundred thirty-eight thousand, seven hundred twenty-nine".