81188456 has 16 divisors (see below), whose sum is σ = 154501440. Its totient is φ = 39988080.

The previous prime is 81188453. The next prime is 81188467. The reversal of 81188456 is 65488118.

It is not an unprimeable number, because it can be changed into a prime (81188453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75200 + ... + 76271.

It is an arithmetic number, because the mean of its divisors is an integer number (9656340).

Almost surely, 2^81188456 is an apocalyptic number.

It is an amenable number.

81188456 is a deficient number, since it is larger than the sum of its proper divisors (73312984).

81188456 is a wasteful number, since it uses less digits than its factorization.

81188456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151544 (or 151540 counting only the distinct ones).

The product of its digits is 61440, while the sum is 41.

The square root of 81188456 is about 9010.4636950603. The cubic root of 81188456 is about 433.0101674689.

The spelling of 81188456 in words is "eighty-one million, one hundred eighty-eight thousand, four hundred fifty-six".