81096240 has 40 divisors (see below), whose sum is σ = 251399088. Its totient is φ = 21625600.

The previous prime is 81096187. The next prime is 81096241. The reversal of 81096240 is 4269018.

It is a tau number, because it is divible by the number of its divisors (40).

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 = 81096198 and 81096207.

It is not an unprimeable number, because it can be changed into a prime (81096241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168711 + ... + 169190.

Almost surely, 2^81096240 is an apocalyptic number.

81096240 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81096240 is an abundant number, since it is smaller than the sum of its proper divisors (170302848).

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

81096240 is a wasteful number, since it uses less digits than its factorization.

81096240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337917 (or 337911 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 81096240 is about 9005.3450794514. The cubic root of 81096240 is about 432.8461638853.

The spelling of 81096240 in words is "eighty-one million, ninety-six thousand, two hundred forty".