128767749 has 8 divisors (see below), whose sum is σ = 187298592. Its totient is φ = 78041040.

The previous prime is 128767747. The next prime is 128767763. The reversal of 128767749 is 947767821.

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

It is not a de Polignac number, because 128767749 - 2¹ = 128767747 is a prime.

It is a super-2 number, since 2×128767749² = 33162266365054002, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128767747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1950994 + ... + 1951059.

It is an arithmetic number, because the mean of its divisors is an integer number (23412324).

Almost surely, 2^128767749 is an apocalyptic number.

It is an amenable number.

128767749 is a deficient number, since it is larger than the sum of its proper divisors (58530843).

128767749 is a wasteful number, since it uses less digits than its factorization.

128767749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3902067.

The product of its digits is 1185408, while the sum is 51.

The square root of 128767749 is about 11347.5878053444. The cubic root of 128767749 is about 504.9740195110.

The spelling of 128767749 in words is "one hundred twenty-eight million, seven hundred sixty-seven thousand, seven hundred forty-nine".