813085778 has 8 divisors (see below), whose sum is σ = 1220814720. Its totient is φ = 406147540.

The previous prime is 813085771. The next prime is 813085813. The reversal of 813085778 is 877580318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×813085778² = 1322216964771730568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (813085771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195098 + ... + 199221.

It is an arithmetic number, because the mean of its divisors is an integer number (152601840).

Almost surely, 2^813085778 is an apocalyptic number.

813085778 is a deficient number, since it is larger than the sum of its proper divisors (407728942).

813085778 is a wasteful number, since it uses less digits than its factorization.

813085778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395352.

The product of its (nonzero) digits is 376320, while the sum is 47.

The square root of 813085778 is about 28514.6590019940. The cubic root of 813085778 is about 933.3519838393.

The spelling of 813085778 in words is "eight hundred thirteen million, eighty-five thousand, seven hundred seventy-eight".