805081956 has 72 divisors (see below), whose sum is σ = 2202633216. Its totient is φ = 228191040.

The previous prime is 805081951. The next prime is 805081973. The reversal of 805081956 is 659180508.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (805081951) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69286 + ... + 80066.

It is an arithmetic number, because the mean of its divisors is an integer number (30592128).

Almost surely, 2^805081956 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 805081956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1101316608).

805081956 is an abundant number, since it is smaller than the sum of its proper divisors (1397551260).

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

805081956 is a wasteful number, since it uses less digits than its factorization.

805081956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10929 (or 10920 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 42.

The square root of 805081956 is about 28373.9661661883. The cubic root of 805081956 is about 930.2793148770.

The spelling of 805081956 in words is "eight hundred five million, eighty-one thousand, nine hundred fifty-six".