1328920552536 has 128 divisors (see below), whose sum is σ = 3582041460480. Its totient is φ = 409363275776.

The previous prime is 1328920552481. The next prime is 1328920552537. The reversal of 1328920552536 is 6352550298231.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1328920552537) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4798435 + ... + 5067821.

It is an arithmetic number, because the mean of its divisors is an integer number (27984698910).

Almost surely, 2^{1328920552536} 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 1328920552536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1791020730240).

1328920552536 is an abundant number, since it is smaller than the sum of its proper divisors (2253120907944).

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

1328920552536 is a wasteful number, since it uses less digits than its factorization.

1328920552536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269633 (or 269629 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 51.

The spelling of 1328920552536 in words is "one trillion, three hundred twenty-eight billion, nine hundred twenty million, five hundred fifty-two thousand, five hundred thirty-six".