805090005906 has 16 divisors (see below), whose sum is σ = 1610188870464. Its totient is φ = 268361858864.

The previous prime is 805090005901. The next prime is 805090005917. The reversal of 805090005906 is 609500090508.

It is a super-2 number, since 2×805090005906² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (805090005901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1735051 + ... + 2149553.

It is an arithmetic number, because the mean of its divisors is an integer number (100636804404).

Almost surely, 2^805090005906 is an apocalyptic number.

805090005906 is an abundant number, since it is smaller than the sum of its proper divisors (805098864558).

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

805090005906 is a wasteful number, since it uses less digits than its factorization.

805090005906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738225.

The product of its (nonzero) digits is 97200, while the sum is 42.

The spelling of 805090005906 in words is "eight hundred five billion, ninety million, five thousand, nine hundred six".