122777680 has 80 divisors (see below), whose sum is σ = 303730560. Its totient is φ = 46052864.

The previous prime is 122777671. The next prime is 122777687. The reversal of 122777680 is 86777221.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122777687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96891 + ... + 98149.

It is an arithmetic number, because the mean of its divisors is an integer number (3796632).

Almost surely, 2^122777680 is an apocalyptic number.

122777680 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 122777680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151865280).

122777680 is an abundant number, since it is smaller than the sum of its proper divisors (180952880).

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

122777680 is a wasteful number, since it uses less digits than its factorization.

122777680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1348 (or 1342 counting only the distinct ones).

The product of its (nonzero) digits is 65856, while the sum is 40.

The square root of 122777680 is about 11080.5090135788. The cubic root of 122777680 is about 497.0191713014.

The spelling of 122777680 in words is "one hundred twenty-two million, seven hundred seventy-seven thousand, six hundred eighty".