78840180 has 36 divisors (see below), whose sum is σ = 239149092. Its totient is φ = 21024000.

The previous prime is 78840149. The next prime is 78840191. The reversal of 78840180 is 8104887.

It can be written as a sum of positive squares in 2 ways, for example, as 58155876 + 20684304 = 7626^2 + 4548^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 218821 + ... + 219180.

Almost surely, 2^78840180 is an apocalyptic number.

It is an amenable number.

78840180 is an abundant number, since it is smaller than the sum of its proper divisors (160308912).

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

78840180 is a wasteful number, since it uses less digits than its factorization.

78840180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438016 (or 438011 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 78840180 is about 8879.1992882241. The cubic root of 78840180 is about 428.7944962560.

The spelling of 78840180 in words is "seventy-eight million, eight hundred forty thousand, one hundred eighty".