128770366 has 4 divisors (see below), whose sum is σ = 193155552. Its totient is φ = 64385182.

The previous prime is 128770361. The next prime is 128770379. The reversal of 128770366 is 663077821.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128770361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32192590 + ... + 32192593.

It is an arithmetic number, because the mean of its divisors is an integer number (48288888).

Almost surely, 2^128770366 is an apocalyptic number.

128770366 is a deficient number, since it is larger than the sum of its proper divisors (64385186).

128770366 is an equidigital number, since it uses as much as digits as its factorization.

128770366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64385185.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 128770366 is about 11347.7031156089. The cubic root of 128770366 is about 504.9774404195.

The spelling of 128770366 in words is "one hundred twenty-eight million, seven hundred seventy thousand, three hundred sixty-six".