128785349 has 16 divisors (see below), whose sum is σ = 167546880. Its totient is φ = 95987760.

The previous prime is 128785331. The next prime is 128785351. The reversal of 128785349 is 943587821.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-128785349 is a prime.

It is a super-2 number, since 2×128785349² = 33171332234103602, 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 (128785649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34589 + ... + 38130.

It is an arithmetic number, because the mean of its divisors is an integer number (10471680).

Almost surely, 2^128785349 is an apocalyptic number.

It is an amenable number.

128785349 is a deficient number, since it is larger than the sum of its proper divisors (38761531).

128785349 is a wasteful number, since it uses less digits than its factorization.

128785349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72760.

The product of its digits is 483840, while the sum is 47.

The square root of 128785349 is about 11348.3632740585. The cubic root of 128785349 is about 504.9970251107.

The spelling of 128785349 in words is "one hundred twenty-eight million, seven hundred eighty-five thousand, three hundred forty-nine".