805045729920 has 256 divisors, whose sum is σ = 2621155852800. Its totient is φ = 210103832576.

The previous prime is 805045729877. The next prime is 805045729921. The reversal of 805045729920 is 29927540508.

It is a super-3 number, since 3×805045729920³ (a number of 37 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (805045729921) 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, 25698907 + ... + 25730213.

It is an arithmetic number, because the mean of its divisors is an integer number (10238890050).

Almost surely, 2^805045729920 is an apocalyptic number.

805045729920 is a gapful number since it is divisible by the number (80) 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 805045729920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1310577926400).

805045729920 is an abundant number, since it is smaller than the sum of its proper divisors (1816110122880).

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

805045729920 is a wasteful number, since it uses less digits than its factorization.

805045729920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31615 (or 31603 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 51.

The spelling of 805045729920 in words is "eight hundred five billion, forty-five million, seven hundred twenty-nine thousand, nine hundred twenty".