81049214736 has 320 divisors, whose sum is σ = 284624640000. Its totient is φ = 21565398528.

The previous prime is 81049214627. The next prime is 81049214759. The reversal of 81049214736 is 63741294018.

81049214736 is a `hidden beast` number, since 8 + 10 + 492 + 147 + 3 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 81049214691 and 81049214700.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3377950 + ... + 3401858.

It is an arithmetic number, because the mean of its divisors is an integer number (889452000).

Almost surely, 2^81049214736 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81049214736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142312320000).

81049214736 is an abundant number, since it is smaller than the sum of its proper divisors (203575425264).

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

81049214736 is a wasteful number, since it uses less digits than its factorization.

81049214736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24011 (or 23999 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 81049214736 in words is "eighty-one billion, forty-nine million, two hundred fourteen thousand, seven hundred thirty-six".