1234567654320 has 640 divisors, whose sum is σ = 5277482219520. Its totient is φ = 230398525440.

The previous prime is 1234567654301. The next prime is 1234567654337. The reversal of 1234567654320 is 234567654321.

It is a happy number.

It is a Cunningham number, because it is equal to 1111111²-1.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 1234567654320.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 8819436 + ... + 8958324.

It is an arithmetic number, because the mean of its divisors is an integer number (8246065968).

Almost surely, 2^{1234567654320} is an apocalyptic number.

1234567654320 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 1234567654320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2638741109760).

1234567654320 is an abundant number, since it is smaller than the sum of its proper divisors (4042914565200).

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

1234567654320 is a wasteful number, since it uses less digits than its factorization.

1234567654320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138973 (or 138967 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 48.

Subtracting from 1234567654320 its reverse (234567654321), we obtain a palindrome (999999999999).

The spelling of 1234567654320 in words is "one trillion, two hundred thirty-four billion, five hundred sixty-seven million, six hundred fifty-four thousand, three hundred twenty".