816378674 has 4 divisors (see below), whose sum is σ = 1224568014. Its totient is φ = 408189336.

The previous prime is 816378611. The next prime is 816378679. The reversal of 816378674 is 476873618.

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., 624750025 + 191628649 = 24995^2 + 13843^2 .

It is not an unprimeable number, because it can be changed into a prime (816378679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204094667 + ... + 204094670.

Almost surely, 2^816378674 is an apocalyptic number.

816378674 is a deficient number, since it is larger than the sum of its proper divisors (408189340).

816378674 is a wasteful number, since it uses less digits than its factorization.

816378674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408189339.

The product of its digits is 1354752, while the sum is 50.

The square root of 816378674 is about 28572.3410661430. The cubic root of 816378674 is about 934.6102731051.

The spelling of 816378674 in words is "eight hundred sixteen million, three hundred seventy-eight thousand, six hundred seventy-four".