122216640 has 224 divisors, whose sum is σ = 477926400. Its totient is φ = 25767936.

The previous prime is 122216629. The next prime is 122216651. The reversal of 122216640 is 46612221.

It is an interprime number because it is at equal distance from previous prime (122216629) and next prime (122216651).

It is a tau number, because it is divible by the number of its divisors (224).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 122216640.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 86661 + ... + 88059.

It is an arithmetic number, because the mean of its divisors is an integer number (2133600).

Almost surely, 2^122216640 is an apocalyptic number.

122216640 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 122216640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (238963200).

122216640 is an abundant number, since it is smaller than the sum of its proper divisors (355709760).

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

122216640 is a wasteful number, since it uses less digits than its factorization.

122216640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1439 (or 1429 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 122216640 is about 11055.1634994694. The cubic root of 122216640 is about 496.2609622240.

Adding to 122216640 its reverse (46612221), we get a palindrome (168828861).

The spelling of 122216640 in words is "one hundred twenty-two million, two hundred sixteen thousand, six hundred forty".