122456778 has 16 divisors (see below), whose sum is σ = 245302176. Its totient is φ = 40754160.

The previous prime is 122456773. The next prime is 122456779. The reversal of 122456778 is 877654221.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (122456773) by changing a digit.

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, 12013 + ... + 19728.

It is an arithmetic number, because the mean of its divisors is an integer number (15331386).

Almost surely, 2^122456778 is an apocalyptic number.

122456778 is an abundant number, since it is smaller than the sum of its proper divisors (122845398).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

122456778 is a wasteful number, since it uses less digits than its factorization.

122456778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32389.

The product of its digits is 188160, while the sum is 42.

The square root of 122456778 is about 11066.0190673973. The cubic root of 122456778 is about 496.5857765557.

The spelling of 122456778 in words is "one hundred twenty-two million, four hundred fifty-six thousand, seven hundred seventy-eight".