813193378 has 8 divisors (see below), whose sum is σ = 1219974300. Its totient is φ = 406535280.

The previous prime is 813193327. The next prime is 813193399. The reversal of 813193378 is 873391318.

It can be written as a sum of positive squares in 2 ways, for example, as 663938289 + 149255089 = 25767^2 + 12217^2 .

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

It is a super-2 number, since 2×813193378² = 1322566940046101768, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11833 + ... + 42028.

Almost surely, 2^813193378 is an apocalyptic number.

813193378 is a deficient number, since it is larger than the sum of its proper divisors (406780922).

813193378 is a wasteful number, since it uses less digits than its factorization.

813193378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61412.

The product of its digits is 108864, while the sum is 43.

The square root of 813193378 is about 28516.5456884245. The cubic root of 813193378 is about 933.3931538472.

The spelling of 813193378 in words is "eight hundred thirteen million, one hundred ninety-three thousand, three hundred seventy-eight".