816636678 has 32 divisors (see below), whose sum is σ = 1918812672. Its totient is φ = 228429600.

The previous prime is 816636673. The next prime is 816636713. The reversal of 816636678 is 876636618.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 816636678.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816636673) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 475038 + ... + 476753.

It is an arithmetic number, because the mean of its divisors is an integer number (59962896).

Almost surely, 2^816636678 is an apocalyptic number.

816636678 is an abundant number, since it is smaller than the sum of its proper divisors (1102175994).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

816636678 is a wasteful number, since it uses less digits than its factorization.

816636678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 951820.

The product of its digits is 1741824, while the sum is 51.

The square root of 816636678 is about 28576.8556352864. The cubic root of 816636678 is about 934.7087191649.

It can be divided in two parts, 8166 and 36678, that added together give a palindrome (44844).

The spelling of 816636678 in words is "eight hundred sixteen million, six hundred thirty-six thousand, six hundred seventy-eight".