64127749 has 32 divisors (see below), whose sum is σ = 80087040. Its totient is φ = 50162112.

The previous prime is 64127743. The next prime is 64127759. The reversal of 64127749 is 94772146.

It is not a de Polignac number, because 64127749 - 2¹⁹ = 63603461 is a prime.

It is a super-2 number, since 2×64127749² = 8224736383614002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64127743) 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 31 ways as a sum of consecutive naturals, for example, 408379 + ... + 408535.

It is an arithmetic number, because the mean of its divisors is an integer number (2502720).

Almost surely, 2^64127749 is an apocalyptic number.

It is an amenable number.

64127749 is a deficient number, since it is larger than the sum of its proper divisors (15959291).

64127749 is a wasteful number, since it uses less digits than its factorization.

64127749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289.

The product of its digits is 84672, while the sum is 40.

The square root of 64127749 is about 8007.9803321437. The cubic root of 64127749 is about 400.2659668649.

It can be divided in two parts, 6412 and 7749, that added together give a square (14161 = 119²).

The spelling of 64127749 in words is "sixty-four million, one hundred twenty-seven thousand, seven hundred forty-nine".