81184087746 has 24 divisors (see below), whose sum is σ = 176042730240. Its totient is φ = 27039228216.

The previous prime is 81184087739. The next prime is 81184087759. The reversal of 81184087746 is 64778048118.

It is a super-2 number, since 2×81184087746² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81184087692 and 81184087701.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1821906 + ... + 1865933.

It is an arithmetic number, because the mean of its divisors is an integer number (7335113760).

Almost surely, 2^81184087746 is an apocalyptic number.

81184087746 is an abundant number, since it is smaller than the sum of its proper divisors (94858642494).

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

81184087746 is a wasteful number, since it uses less digits than its factorization.

81184087746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3689070 (or 3689067 counting only the distinct ones).

The product of its (nonzero) digits is 2408448, while the sum is 54.

The spelling of 81184087746 in words is "eighty-one billion, one hundred eighty-four million, eighty-seven thousand, seven hundred forty-six".