123455322240 has 128 divisors (see below), whose sum is σ = 396518569920. Its totient is φ = 32670044160.

The previous prime is 123455322227. The next prime is 123455322269. The reversal of 123455322240 is 42223554321.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6102 + ... + 496938.

Almost surely, 2^123455322240 is an apocalyptic number.

123455322240 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 123455322240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (198259284960).

123455322240 is an abundant number, since it is smaller than the sum of its proper divisors (273063247680).

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

123455322240 is a wasteful number, since it uses less digits than its factorization.

123455322240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490990 (or 490978 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 33.

Adding to 123455322240 its reverse (42223554321), we get a palindrome (165678876561).

The spelling of 123455322240 in words is "one hundred twenty-three billion, four hundred fifty-five million, three hundred twenty-two thousand, two hundred forty".