78838819810 has 8 divisors (see below), whose sum is σ = 141909875676. Its totient is φ = 31535527920.

The previous prime is 78838819789. The next prime is 78838819819. The reversal of 78838819810 is 1891883887.

It can be written as a sum of positive squares in 2 ways, for example, as 77252311249 + 1586508561 = 277943^2 + 39831^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×78838819810² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78838819819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3941940981 + ... + 3941941000.

Almost surely, 2^78838819810 is an apocalyptic number.

78838819810 is a deficient number, since it is larger than the sum of its proper divisors (63071055866).

78838819810 is a wasteful number, since it uses less digits than its factorization.

78838819810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7883881988.

The product of its (nonzero) digits is 6193152, while the sum is 61.

The spelling of 78838819810 in words is "seventy-eight billion, eight hundred thirty-eight million, eight hundred nineteen thousand, eight hundred ten".