128478782 has 8 divisors (see below), whose sum is σ = 201097296. Its totient is φ = 61446352.

The previous prime is 128478781. The next prime is 128478811. The reversal of 128478782 is 287874821.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128478781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1396463 + ... + 1396554.

It is an arithmetic number, because the mean of its divisors is an integer number (25137162).

Almost surely, 2^128478782 is an apocalyptic number.

128478782 is a deficient number, since it is larger than the sum of its proper divisors (72618514).

128478782 is a wasteful number, since it uses less digits than its factorization.

128478782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2793042.

The product of its digits is 401408, while the sum is 47.

The square root of 128478782 is about 11334.8481242582. The cubic root of 128478782 is about 504.5960001227.

The spelling of 128478782 in words is "one hundred twenty-eight million, four hundred seventy-eight thousand, seven hundred eighty-two".