81127140 has 24 divisors (see below), whose sum is σ = 227156160. Its totient is φ = 21633888.

The previous prime is 81127099. The next prime is 81127147. The reversal of 81127140 is 4172118.

It is a super-2 number, since 2×81127140² = 13163225689159200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81127140.

It is not an unprimeable number, because it can be changed into a prime (81127147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 676000 + ... + 676119.

It is an arithmetic number, because the mean of its divisors is an integer number (9464840).

Almost surely, 2^81127140 is an apocalyptic number.

It is an amenable number.

81127140 is an abundant number, since it is smaller than the sum of its proper divisors (146029020).

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

81127140 is a wasteful number, since it uses less digits than its factorization.

81127140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1352131 (or 1352129 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 81127140 is about 9007.0605638022. The cubic root of 81127140 is about 432.9011325172.

Adding to 81127140 its reverse (4172118), we get a palindrome (85299258).

The spelling of 81127140 in words is "eighty-one million, one hundred twenty-seven thousand, one hundred forty".