128417783 has 4 divisors (see below), whose sum is σ = 138296088. Its totient is φ = 118539480.

The previous prime is 128417767. The next prime is 128417801. The reversal of 128417783 is 387714821.

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

It is a cyclic number.

It is not a de Polignac number, because 128417783 - 2⁴ = 128417767 is a prime.

It is a super-2 number, since 2×128417783² = 32982253981270178, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128417783.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128417753) 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, 4939133 + ... + 4939158.

It is an arithmetic number, because the mean of its divisors is an integer number (34574022).

Almost surely, 2^128417783 is an apocalyptic number.

128417783 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

128417783 is a deficient number, since it is larger than the sum of its proper divisors (9878305).

128417783 is an equidigital number, since it uses as much as digits as its factorization.

128417783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9878304.

The product of its digits is 75264, while the sum is 41.

The square root of 128417783 is about 11332.1570320923. The cubic root of 128417783 is about 504.5161303226.

The spelling of 128417783 in words is "one hundred twenty-eight million, four hundred seventeen thousand, seven hundred eighty-three".