64239649 has 8 divisors (see below), whose sum is σ = 65799360. Its totient is φ = 62696400.

The previous prime is 64239641. The next prime is 64239653. The reversal of 64239649 is 94693246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64239649 - 2³ = 64239641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64239641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3972 + ... + 12010.

It is an arithmetic number, because the mean of its divisors is an integer number (8224920).

Almost surely, 2^64239649 is an apocalyptic number.

It is an amenable number.

64239649 is a deficient number, since it is larger than the sum of its proper divisors (1559711).

64239649 is a wasteful number, since it uses less digits than its factorization.

64239649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8231.

The product of its digits is 279936, while the sum is 43.

The square root of 64239649 is about 8014.9640672931. The cubic root of 64239649 is about 400.4986468699.

The spelling of 64239649 in words is "sixty-four million, two hundred thirty-nine thousand, six hundred forty-nine".