1229728472544 has 384 divisors, whose sum is σ = 3961735142400. Its totient is φ = 328652881920.

The previous prime is 1229728472509. The next prime is 1229728472551. The reversal of 1229728472544 is 4452748279221.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 388047792 + ... + 388050960.

It is an arithmetic number, because the mean of its divisors is an integer number (10317018600).

Almost surely, 2^{1229728472544} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1229728472544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1980867571200).

1229728472544 is an abundant number, since it is smaller than the sum of its proper divisors (2732006669856).

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

1229728472544 is a wasteful number, since it uses less digits than its factorization.

1229728472544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4458 (or 4450 counting only the distinct ones).

The product of its digits is 18063360, while the sum is 57.

The spelling of 1229728472544 in words is "one trillion, two hundred twenty-nine billion, seven hundred twenty-eight million, four hundred seventy-two thousand, five hundred forty-four".