819936678 has 64 divisors (see below), whose sum is σ = 1890028800. Its totient is φ = 234524160.

The previous prime is 819936671. The next prime is 819936679. The reversal of 819936678 is 876639918.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819936671) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 391458 + ... + 393546.

It is an arithmetic number, because the mean of its divisors is an integer number (29531700).

Almost surely, 2^819936678 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 819936678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (945014400).

819936678 is an abundant number, since it is smaller than the sum of its proper divisors (1070092122).

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

819936678 is a wasteful number, since it uses less digits than its factorization.

819936678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2437.

The product of its digits is 3919104, while the sum is 57.

The square root of 819936678 is about 28634.5364551270. The cubic root of 819936678 is about 935.9660686984.

The spelling of 819936678 in words is "eight hundred nineteen million, nine hundred thirty-six thousand, six hundred seventy-eight".