64249729 has 4 divisors (see below), whose sum is σ = 64323376. Its totient is φ = 64176084.

The previous prime is 64249721. The next prime is 64249733. The reversal of 64249729 is 92794246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64249729 - 2³ = 64249721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64249721) 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, 35499 + ... + 37264.

It is an arithmetic number, because the mean of its divisors is an integer number (16080844).

Almost surely, 2^64249729 is an apocalyptic number.

It is an amenable number.

64249729 is a deficient number, since it is larger than the sum of its proper divisors (73647).

64249729 is an equidigital number, since it uses as much as digits as its factorization.

64249729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73646.

The product of its digits is 217728, while the sum is 43.

The square root of 64249729 is about 8015.5928664073. The cubic root of 64249729 is about 400.5195935142.

The spelling of 64249729 in words is "sixty-four million, two hundred forty-nine thousand, seven hundred twenty-nine".