808642858 has 4 divisors (see below), whose sum is σ = 1212964290. Its totient is φ = 404321428.

The previous prime is 808642853. The next prime is 808642921. The reversal of 808642858 is 858246808.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 511528689 + 297114169 = 22617^2 + 17237^2 .

It is not an unprimeable number, because it can be changed into a prime (808642853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202160713 + ... + 202160716.

Almost surely, 2^808642858 is an apocalyptic number.

808642858 is a deficient number, since it is larger than the sum of its proper divisors (404321432).

808642858 is a wasteful number, since it uses less digits than its factorization.

808642858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404321431.

The product of its (nonzero) digits is 983040, while the sum is 49.

The square root of 808642858 is about 28436.6463915842. The cubic root of 808642858 is about 931.6488489368.

The spelling of 808642858 in words is "eight hundred eight million, six hundred forty-two thousand, eight hundred fifty-eight".