816946878 has 64 divisors (see below), whose sum is σ = 1850688000. Its totient is φ = 238143360.

The previous prime is 816946847. The next prime is 816946891. The reversal of 816946878 is 878649618.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 667375 + ... + 668597.

It is an arithmetic number, because the mean of its divisors is an integer number (28917000).

Almost surely, 2^816946878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 816946878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (925344000).

816946878 is an abundant number, since it is smaller than the sum of its proper divisors (1033741122).

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

816946878 is a wasteful number, since it uses less digits than its factorization.

816946878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1617.

The product of its digits is 4644864, while the sum is 57.

The square root of 816946878 is about 28582.2825890446. The cubic root of 816946878 is about 934.8270540981.

The spelling of 816946878 in words is "eight hundred sixteen million, nine hundred forty-six thousand, eight hundred seventy-eight".