805457091280 has 40 divisors (see below), whose sum is σ = 1890869190912. Its totient is φ = 319054844544.

The previous prime is 805457091251. The next prime is 805457091289. The reversal of 805457091280 is 82190754508.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×805457091280² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805457091289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48866584 + ... + 48883063.

Almost surely, 2^805457091280 is an apocalyptic number.

805457091280 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

805457091280 is an abundant number, since it is smaller than the sum of its proper divisors (1085412099632).

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

805457091280 is a wasteful number, since it uses less digits than its factorization.

805457091280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97749763 (or 97749757 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 49.

The spelling of 805457091280 in words is "eight hundred five billion, four hundred fifty-seven million, ninety-one thousand, two hundred eighty".