64243749 has 8 divisors (see below), whose sum is σ = 88421632. Its totient is φ = 41447520.

The previous prime is 64243747. The next prime is 64243771. The reversal of 64243749 is 94734246.

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

It is not a de Polignac number, because 64243749 - 2¹ = 64243747 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 (64243747) 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, 345304 + ... + 345489.

It is an arithmetic number, because the mean of its divisors is an integer number (11052704).

Almost surely, 2^64243749 is an apocalyptic number.

It is an amenable number.

64243749 is a deficient number, since it is larger than the sum of its proper divisors (24177883).

64243749 is a wasteful number, since it uses less digits than its factorization.

64243749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690827.

The product of its digits is 145152, while the sum is 39.

The square root of 64243749 is about 8015.2198347893. The cubic root of 64243749 is about 400.5071670987.

The spelling of 64243749 in words is "sixty-four million, two hundred forty-three thousand, seven hundred forty-nine".