78819356 has 24 divisors (see below), whose sum is σ = 171970176. Its totient is φ = 30708720.

The previous prime is 78819337. The next prime is 78819359. The reversal of 78819356 is 65391887.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 78819356.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78819359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127646 + ... + 128261.

It is an arithmetic number, because the mean of its divisors is an integer number (7165424).

Almost surely, 2^78819356 is an apocalyptic number.

It is an amenable number.

78819356 is an abundant number, since it is smaller than the sum of its proper divisors (93150820).

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

78819356 is a wasteful number, since it uses less digits than its factorization.

78819356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255929 (or 255927 counting only the distinct ones).

The product of its digits is 362880, while the sum is 47.

The square root of 78819356 is about 8878.0265825238. The cubic root of 78819356 is about 428.7567405378.

The spelling of 78819356 in words is "seventy-eight million, eight hundred nineteen thousand, three hundred fifty-six".