129778755 has 8 divisors (see below), whose sum is σ = 207646032. Its totient is φ = 69215328.

The previous prime is 129778729. The next prime is 129778769. The reversal of 129778755 is 557877921.

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

It is not a de Polignac number, because 129778755 - 2¹⁰ = 129777731 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129778698 and 129778707.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4325944 + ... + 4325973.

It is an arithmetic number, because the mean of its divisors is an integer number (25955754).

Almost surely, 2^129778755 is an apocalyptic number.

129778755 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

129778755 is a deficient number, since it is larger than the sum of its proper divisors (77867277).

129778755 is an equidigital number, since it uses as much as digits as its factorization.

129778755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8651925.

The product of its digits is 1234800, while the sum is 51.

The square root of 129778755 is about 11392.0478843797. The cubic root of 129778755 is about 506.2921586595.

The spelling of 129778755 in words is "one hundred twenty-nine million, seven hundred seventy-eight thousand, seven hundred fifty-five".