128770663 has 4 divisors (see below), whose sum is σ = 147166480. Its totient is φ = 110374848.

The previous prime is 128770639. The next prime is 128770667. The reversal of 128770663 is 366077821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 366077821 = 23 ⋅15916427.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128770663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128770667) 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, 9197898 + ... + 9197911.

It is an arithmetic number, because the mean of its divisors is an integer number (36791620).

Almost surely, 2^128770663 is an apocalyptic number.

128770663 is a deficient number, since it is larger than the sum of its proper divisors (18395817).

128770663 is an equidigital number, since it uses as much as digits as its factorization.

128770663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18395816.

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

The square root of 128770663 is about 11347.7162019501. The cubic root of 128770663 is about 504.9778286512.

The spelling of 128770663 in words is "one hundred twenty-eight million, seven hundred seventy thousand, six hundred sixty-three".