78812181 has 24 divisors (see below), whose sum is σ = 130338624. Its totient is φ = 44953920.

The previous prime is 78812179. The next prime is 78812197. The reversal of 78812181 is 18121887.

It is not a de Polignac number, because 78812181 - 2¹ = 78812179 is a prime.

It is a super-2 number, since 2×78812181² = 12422719747953522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78812131) 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 23 ways as a sum of consecutive naturals, for example, 59001 + ... + 60321.

It is an arithmetic number, because the mean of its divisors is an integer number (5430776).

Almost surely, 2^78812181 is an apocalyptic number.

It is an amenable number.

78812181 is a deficient number, since it is larger than the sum of its proper divisors (51526443).

78812181 is a wasteful number, since it uses less digits than its factorization.

78812181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2281 (or 2278 counting only the distinct ones).

The product of its digits is 7168, while the sum is 36.

The square root of 78812181 is about 8877.6224857785. The cubic root of 78812181 is about 428.7437301001.

It can be divided in two parts, 7 and 8812181, that added together give a palindrome (8812188).

The spelling of 78812181 in words is "seventy-eight million, eight hundred twelve thousand, one hundred eighty-one".