122687778 has 16 divisors (see below), whose sum is σ = 248332896. Its totient is φ = 40403040.

The previous prime is 122687771. The next prime is 122687797. The reversal of 122687778 is 877786221.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (122687771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122683 + ... + 123678.

It is an arithmetic number, because the mean of its divisors is an integer number (15520806).

Almost surely, 2^122687778 is an apocalyptic number.

122687778 is an abundant number, since it is smaller than the sum of its proper divisors (125645118).

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

122687778 is a wasteful number, since it uses less digits than its factorization.

122687778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246449.

The product of its digits is 526848, while the sum is 48.

The square root of 122687778 is about 11076.4515075903. The cubic root of 122687778 is about 496.8978302235.

The spelling of 122687778 in words is "one hundred twenty-two million, six hundred eighty-seven thousand, seven hundred seventy-eight".