81196140 has 24 divisors (see below), whose sum is σ = 227349360. Its totient is φ = 21652288.

The previous prime is 81196117. The next prime is 81196151. The reversal of 81196140 is 4169118.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 81196098 and 81196107.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 676575 + ... + 676694.

It is an arithmetic number, because the mean of its divisors is an integer number (9472890).

Almost surely, 2^81196140 is an apocalyptic number.

It is an amenable number.

81196140 is an abundant number, since it is smaller than the sum of its proper divisors (146153220).

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

81196140 is a wasteful number, since it uses less digits than its factorization.

81196140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1353281 (or 1353279 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 81196140 is about 9010.8900781221. The cubic root of 81196140 is about 433.0238276423.

The spelling of 81196140 in words is "eighty-one million, one hundred ninety-six thousand, one hundred forty".