128417779 has 24 divisors (see below), whose sum is σ = 163306368. Its totient is φ = 100235520.

The previous prime is 128417767. The next prime is 128417801. The reversal of 128417779 is 977714821.

It is not a de Polignac number, because 128417779 - 2⁵ = 128417747 is a prime.

It is a super-2 number, since 2×128417779² = 32982251926585682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128417719) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23337 + ... + 28309.

It is an arithmetic number, because the mean of its divisors is an integer number (6804432).

Almost surely, 2^128417779 is an apocalyptic number.

128417779 is a deficient number, since it is larger than the sum of its proper divisors (34888589).

128417779 is a wasteful number, since it uses less digits than its factorization.

128417779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5035 (or 5028 counting only the distinct ones).

The product of its digits is 197568, while the sum is 46.

The square root of 128417779 is about 11332.1568556034. The cubic root of 128417779 is about 504.5161250843.

The spelling of 128417779 in words is "one hundred twenty-eight million, four hundred seventeen thousand, seven hundred seventy-nine".