808213540 has 12 divisors (see below), whose sum is σ = 1697248476. Its totient is φ = 323285408.

The previous prime is 808213531. The next prime is 808213547. The reversal of 808213540 is 45312808.

It can be written as a sum of positive squares in 2 ways, for example, as 232501504 + 575712036 = 15248^2 + 23994^2 .

It is not an unprimeable number, because it can be changed into a prime (808213547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20205319 + ... + 20205358.

It is an arithmetic number, because the mean of its divisors is an integer number (141437373).

Almost surely, 2^808213540 is an apocalyptic number.

It is an amenable number.

808213540 is an abundant number, since it is smaller than the sum of its proper divisors (889034936).

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

808213540 is a wasteful number, since it uses less digits than its factorization.

808213540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40410686 (or 40410684 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 808213540 is about 28429.0967144579. The cubic root of 808213540 is about 931.4839453081.

The spelling of 808213540 in words is "eight hundred eight million, two hundred thirteen thousand, five hundred forty".