122777980 has 48 divisors (see below), whose sum is σ = 286642944. Its totient is φ = 43868160.

The previous prime is 122777971. The next prime is 122777983. The reversal of 122777980 is 89777221.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122777983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 444 + ... + 15676.

It is an arithmetic number, because the mean of its divisors is an integer number (5971728).

Almost surely, 2^122777980 is an apocalyptic number.

122777980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 122777980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143321472).

122777980 is an abundant number, since it is smaller than the sum of its proper divisors (163864964).

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

122777980 is a wasteful number, since it uses less digits than its factorization.

122777980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15286 (or 15284 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 43.

The square root of 122777980 is about 11080.5225508547. The cubic root of 122777980 is about 497.0195761134.

The spelling of 122777980 in words is "one hundred twenty-two million, seven hundred seventy-seven thousand, nine hundred eighty".