122102778 has 64 divisors (see below), whose sum is σ = 299427840. Its totient is φ = 32415552.

The previous prime is 122102777. The next prime is 122102779. The reversal of 122102778 is 877201221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (122102777) and next prime (122102779).

It is a super-3 number, since 3×122102778³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (122102777) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40851 + ... + 43737.

It is an arithmetic number, because the mean of its divisors is an integer number (4678560).

Almost surely, 2^122102778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 122102778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149713920).

122102778 is an abundant number, since it is smaller than the sum of its proper divisors (177325062).

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

122102778 is a wasteful number, since it uses less digits than its factorization.

122102778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2971.

The product of its (nonzero) digits is 3136, while the sum is 30.

The square root of 122102778 is about 11050.0125791784. The cubic root of 122102778 is about 496.1068020314.

Adding to 122102778 its reverse (877201221), we get a palindrome (999303999).

The spelling of 122102778 in words is "one hundred twenty-two million, one hundred two thousand, seven hundred seventy-eight".