816545678 has 16 divisors (see below), whose sum is σ = 1376385696. Its totient is φ = 360481440.

The previous prime is 816545677. The next prime is 816545687. The reversal of 816545678 is 876545618.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816545671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 682133 + ... + 683328.

It is an arithmetic number, because the mean of its divisors is an integer number (86024106).

Almost surely, 2^816545678 is an apocalyptic number.

816545678 is a deficient number, since it is larger than the sum of its proper divisors (559840018).

816545678 is a wasteful number, since it uses less digits than its factorization.

816545678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1365499.

The product of its digits is 1612800, while the sum is 50.

The square root of 816545678 is about 28575.2633933617. The cubic root of 816545678 is about 934.6739988479.

The spelling of 816545678 in words is "eight hundred sixteen million, five hundred forty-five thousand, six hundred seventy-eight".