123677778 has 16 divisors (see below), whose sum is σ = 282692160. Its totient is φ = 35336496.

The previous prime is 123677777. The next prime is 123677797. The reversal of 123677778 is 877776321.

It is a happy number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (123677777) 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, 1472313 + ... + 1472396.

It is an arithmetic number, because the mean of its divisors is an integer number (17668260).

Almost surely, 2^123677778 is an apocalyptic number.

123677778 is an abundant number, since it is smaller than the sum of its proper divisors (159014382).

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

123677778 is a wasteful number, since it uses less digits than its factorization.

123677778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2944721.

The product of its digits is 691488, while the sum is 48.

The square root of 123677778 is about 11121.0511193862. The cubic root of 123677778 is about 498.2307844700.

The spelling of 123677778 in words is "one hundred twenty-three million, six hundred seventy-seven thousand, seven hundred seventy-eight".