81112380 has 48 divisors (see below), whose sum is σ = 227520384. Its totient is φ = 21591360.

The previous prime is 81112379. The next prime is 81112403. The reversal of 81112380 is 8321118.

It is a super-4 number, since 4×81112380⁴ (a number of 33 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81112380.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52215 + ... + 53745.

It is an arithmetic number, because the mean of its divisors is an integer number (4740008).

Almost surely, 2^81112380 is an apocalyptic number.

It is an amenable number.

81112380 is an abundant number, since it is smaller than the sum of its proper divisors (146408004).

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

81112380 is a wasteful number, since it uses less digits than its factorization.

81112380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2426 (or 2424 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 81112380 is about 9006.2411693225. The cubic root of 81112380 is about 432.8748773977.

Adding to 81112380 its reverse (8321118), we get a palindrome (89433498).

The spelling of 81112380 in words is "eighty-one million, one hundred twelve thousand, three hundred eighty".