128049747 has 32 divisors (see below), whose sum is σ = 202506240. Its totient is φ = 70428960.

The previous prime is 128049739. The next prime is 128049767. The reversal of 128049747 is 747940821.

It is a happy number.

It is not a de Polignac number, because 128049747 - 2³ = 128049739 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128049699 and 128049708.

It is not an unprimeable number, because it can be changed into a prime (128049737) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 155178 + ... + 156000.

It is an arithmetic number, because the mean of its divisors is an integer number (6328320).

Almost surely, 2^128049747 is an apocalyptic number.

128049747 is a deficient number, since it is larger than the sum of its proper divisors (74456493).

128049747 is a wasteful number, since it uses less digits than its factorization.

128049747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1103.

The product of its (nonzero) digits is 112896, while the sum is 42.

The square root of 128049747 is about 11315.9068129779. The cubic root of 128049747 is about 504.0337003480.

The spelling of 128049747 in words is "one hundred twenty-eight million, forty-nine thousand, seven hundred forty-seven".