81046784 has 144 divisors (see below), whose sum is σ = 206035200. Its totient is φ = 31610880.

The previous prime is 81046783. The next prime is 81046843. The reversal of 81046784 is 48764018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81046781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1141469 + ... + 1141539.

It is an arithmetic number, because the mean of its divisors is an integer number (1430800).

Almost surely, 2^81046784 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 81046784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103017600).

81046784 is an abundant number, since it is smaller than the sum of its proper divisors (124988416).

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

81046784 is an equidigital number, since it uses as much as digits as its factorization.

81046784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121 (or 93 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 81046784 is about 9002.5987359206. The cubic root of 81046784 is about 432.7581565459.

The spelling of 81046784 in words is "eighty-one million, forty-six thousand, seven hundred eighty-four".