1228694615920 has 160 divisors (see below), whose sum is σ = 3138884812800. Its totient is φ = 445214195712.

The previous prime is 1228694615881. The next prime is 1228694615933. The reversal of 1228694615920 is 295164968221.

It is a congruent number.

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, 174551761 + ... + 174558799.

It is an arithmetic number, because the mean of its divisors is an integer number (19618030080).

Almost surely, 2^{1228694615920} is an apocalyptic number.

1228694615920 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 1228694615920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1569442406400).

1228694615920 is an abundant number, since it is smaller than the sum of its proper divisors (1910190196880).

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

1228694615920 is a wasteful number, since it uses less digits than its factorization.

1228694615920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12087 (or 12081 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 55.

The spelling of 1228694615920 in words is "one trillion, two hundred twenty-eight billion, six hundred ninety-four million, six hundred fifteen thousand, nine hundred twenty".