122557780 has 12 divisors (see below), whose sum is σ = 257371380. Its totient is φ = 49023104.

The previous prime is 122557769. The next prime is 122557843. The reversal of 122557780 is 87755221.

It can be written as a sum of positive squares in 2 ways, for example, as 55383364 + 67174416 = 7442^2 + 8196^2 .

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 3063925 + ... + 3063964.

It is an arithmetic number, because the mean of its divisors is an integer number (21447615).

Almost surely, 2^122557780 is an apocalyptic number.

122557780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

122557780 is an abundant number, since it is smaller than the sum of its proper divisors (134813600).

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

122557780 is a wasteful number, since it uses less digits than its factorization.

122557780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6127898 (or 6127896 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 37.

The square root of 122557780 is about 11070.5817371988. The cubic root of 122557780 is about 496.7222665461.

The spelling of 122557780 in words is "one hundred twenty-two million, five hundred fifty-seven thousand, seven hundred eighty".