780921889792128 has 640 divisors, whose sum is σ = 2790092748960000. Its totient is φ = 211987232759808.

The previous prime is 780921889792067. The next prime is 780921889792129. The reversal of 780921889792128 is 821297988129087.

780921889792128 is a `hidden beast` number, since 78 + 0 + 92 + 188 + 9 + 79 + 212 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is not an unprimeable number, because it can be changed into a prime (780921889792129) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 247148058 + ... + 250287846.

It is an arithmetic number, because the mean of its divisors is an integer number (4359519920250).

Almost surely, 2^{780921889792128} 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 780921889792128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1395046374480000).

780921889792128 is an abundant number, since it is smaller than the sum of its proper divisors (2009170859167872).

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

780921889792128 is a wasteful number, since it uses less digits than its factorization.

780921889792128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3139994 (or 3139973 counting only the distinct ones).

The product of its (nonzero) digits is 1170505728, while the sum is 81.

The spelling of 780921889792128 in words is "seven hundred eighty trillion, nine hundred twenty-one billion, eight hundred eighty-nine million, seven hundred ninety-two thousand, one hundred twenty-eight".