78985812 has 24 divisors (see below), whose sum is σ = 194000800. Its totient is φ = 24942816.

The previous prime is 78985811. The next prime is 78985817. The reversal of 78985812 is 21858987.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78985811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172987 + ... + 173442.

Almost surely, 2^78985812 is an apocalyptic number.

It is an amenable number.

78985812 is an abundant number, since it is smaller than the sum of its proper divisors (115014988).

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

78985812 is a wasteful number, since it uses less digits than its factorization.

78985812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346455 (or 346453 counting only the distinct ones).

The product of its digits is 322560, while the sum is 48.

The square root of 78985812 is about 8887.3962441201. The cubic root of 78985812 is about 429.0583540575.

It can be divided in two parts, 78985 and 812, that added together give a palindrome (79797).

The spelling of 78985812 in words is "seventy-eight million, nine hundred eighty-five thousand, eight hundred twelve".