813408278 has 16 divisors (see below), whose sum is σ = 1308564720. Its totient is φ = 378027936.

The previous prime is 813408263. The next prime is 813408311. The reversal of 813408278 is 872804318.

It is a super-3 number, since 3×813408278³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 199925 + ... + 203952.

It is an arithmetic number, because the mean of its divisors is an integer number (81785295).

Almost surely, 2^813408278 is an apocalyptic number.

813408278 is a deficient number, since it is larger than the sum of its proper divisors (495156442).

813408278 is a wasteful number, since it uses less digits than its factorization.

813408278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403951.

The product of its (nonzero) digits is 86016, while the sum is 41.

The square root of 813408278 is about 28520.3134274503. The cubic root of 813408278 is about 933.4753682083.

The spelling of 813408278 in words is "eight hundred thirteen million, four hundred eight thousand, two hundred seventy-eight".