494778878 has 16 divisors (see below), whose sum is σ = 815823360. Its totient is φ = 223181400.

The previous prime is 494778877. The next prime is 494778881. The reversal of 494778878 is 878877494.

It is a super-2 number, since 2×494778878² = 489612276229877768, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 494778878.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (494778871) 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, 82958 + ... + 88721.

It is an arithmetic number, because the mean of its divisors is an integer number (50988960).

Almost surely, 2^494778878 is an apocalyptic number.

494778878 is a deficient number, since it is larger than the sum of its proper divisors (321044482).

494778878 is a wasteful number, since it uses less digits than its factorization.

494778878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171823.

The product of its digits is 25288704, while the sum is 62.

The square root of 494778878 is about 22243.6255587977. The cubic root of 494778878 is about 790.9281821252.

The spelling of 494778878 in words is "four hundred ninety-four million, seven hundred seventy-eight thousand, eight hundred seventy-eight".