128448749 has 8 divisors (see below), whose sum is σ = 150904992. Its totient is φ = 107789040.

The previous prime is 128448739. The next prime is 128448751. The reversal of 128448749 is 947844821.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128448749 is a prime.

It is a super-2 number, since 2×128448749² = 32998162239330002, 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 (128448739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 448979 + ... + 449264.

It is an arithmetic number, because the mean of its divisors is an integer number (18863124).

Almost surely, 2^128448749 is an apocalyptic number.

It is an amenable number.

128448749 is a deficient number, since it is larger than the sum of its proper divisors (22456243).

128448749 is a wasteful number, since it uses less digits than its factorization.

128448749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898267.

The product of its digits is 516096, while the sum is 47.

The square root of 128448749 is about 11333.5232386050. The cubic root of 128448749 is about 504.5566792002.

The spelling of 128448749 in words is "one hundred twenty-eight million, four hundred forty-eight thousand, seven hundred forty-nine".