122711778 has 54 divisors (see below), whose sum is σ = 310115169. Its totient is φ = 34966512.

The previous prime is 122711777. The next prime is 122711791. The reversal of 122711778 is 877117221.

It can be written as a sum of positive squares in 2 ways, for example, as 122478489 + 233289 = 11067^2 + 483^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=7833.

It is not an unprimeable number, because it can be changed into a prime (122711777) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 328800 + ... + 329172.

Almost surely, 2^122711778 is an apocalyptic number.

122711778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 122711778

122711778 is an abundant number, since it is smaller than the sum of its proper divisors (187403391).

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

122711778 is an equidigital number, since it uses as much as digits as its factorization.

122711778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768 (or 385 counting only the distinct ones).

The product of its digits is 10976, while the sum is 36.

The square root of 122711778 is about 11077.5348340685. The cubic root of 122711778 is about 496.9302289149.

Adding to 122711778 its reverse (877117221), we get a palindrome (999828999).

The spelling of 122711778 in words is "one hundred twenty-two million, seven hundred eleven thousand, seven hundred seventy-eight".