128750775 has 24 divisors (see below), whose sum is σ = 225391824. Its totient is φ = 64627200.

The previous prime is 128750773. The next prime is 128750777. The reversal of 128750775 is 577057821.

It is an interprime number because it is at equal distance from previous prime (128750773) and next prime (128750777).

It is not a de Polignac number, because 128750775 - 2¹ = 128750773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128750771) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49216 + ... + 51765.

It is an arithmetic number, because the mean of its divisors is an integer number (9391326).

Almost surely, 2^128750775 is an apocalyptic number.

128750775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128750775 is a deficient number, since it is larger than the sum of its proper divisors (96641049).

128750775 is a wasteful number, since it uses less digits than its factorization.

128750775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101011 (or 101006 counting only the distinct ones).

The product of its (nonzero) digits is 137200, while the sum is 42.

The square root of 128750775 is about 11346.8398684391. The cubic root of 128750775 is about 504.9518301929.

The spelling of 128750775 in words is "one hundred twenty-eight million, seven hundred fifty thousand, seven hundred seventy-five".