128063749 has 4 divisors (see below), whose sum is σ = 139705920. Its totient is φ = 116421580.

The previous prime is 128063731. The next prime is 128063753. The reversal of 128063749 is 947360821.

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 not a de Polignac number, because 128063749 - 2⁹ = 128063237 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 (128063729) 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 3 ways as a sum of consecutive naturals, for example, 5821069 + ... + 5821090.

It is an arithmetic number, because the mean of its divisors is an integer number (34926480).

Almost surely, 2^128063749 is an apocalyptic number.

It is an amenable number.

128063749 is a deficient number, since it is larger than the sum of its proper divisors (11642171).

128063749 is a wasteful number, since it uses less digits than its factorization.

128063749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11642170.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 128063749 is about 11316.5254826736. The cubic root of 128063749 is about 504.0520713921.

The spelling of 128063749 in words is "one hundred twenty-eight million, sixty-three thousand, seven hundred forty-nine".