816494778 has 48 divisors (see below), whose sum is σ = 1934150400. Its totient is φ = 246877440.

The previous prime is 816494773. The next prime is 816494803. The reversal of 816494778 is 877494618.

It is a happy number.

816494778 is a `hidden beast` number, since 8 + 164 + 9 + 477 + 8 = 666.

816494778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (816494773) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 90538 + ... + 99146.

It is an arithmetic number, because the mean of its divisors is an integer number (40294800).

Almost surely, 2^816494778 is an apocalyptic number.

816494778 is an abundant number, since it is smaller than the sum of its proper divisors (1117655622).

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

816494778 is a wasteful number, since it uses less digits than its factorization.

816494778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9107 (or 9104 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 54.

The square root of 816494778 is about 28574.3727490211. The cubic root of 816494778 is about 934.6545772379.

It can be divided in two parts, 816 and 494778, that added together give a palindrome (495594).

The spelling of 816494778 in words is "eight hundred sixteen million, four hundred ninety-four thousand, seven hundred seventy-eight".