122128780 has 24 divisors (see below), whose sum is σ = 256731552. Its totient is φ = 48801792.

The previous prime is 122128763. The next prime is 122128807. The reversal of 122128780 is 87821221.

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, 21964 + ... + 26956.

It is an arithmetic number, because the mean of its divisors is an integer number (10697148).

Almost surely, 2^122128780 is an apocalyptic number.

122128780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

122128780 is an abundant number, since it is smaller than the sum of its proper divisors (134602772).

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

122128780 is a wasteful number, since it uses less digits than its factorization.

122128780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6225 (or 6223 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 122128780 is about 11051.1890762940. The cubic root of 122128780 is about 496.1420151355.

The spelling of 122128780 in words is "one hundred twenty-two million, one hundred twenty-eight thousand, seven hundred eighty".