81504783360 has 2816 divisors, whose sum is σ = 422579404800. Its totient is φ = 14332723200.

The previous prime is 81504783331. The next prime is 81504783377. The reversal of 81504783360 is 6338740518.

81504783360 is a `hidden beast` number, since 8 + 1 + 504 + 7 + 83 + 3 + 60 = 666.

It is a tau number, because it is divible by the number of its divisors (2816).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 2629186545 + ... + 2629186575.

Almost surely, 2^81504783360 is an apocalyptic number.

81504783360 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81504783360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211289702400).

81504783360 is an abundant number, since it is smaller than the sum of its proper divisors (341074621440).

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

81504783360 is a wasteful number, since it uses less digits than its factorization.

81504783360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 91 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 81504783360 in words is "eighty-one billion, five hundred four million, seven hundred eighty-three thousand, three hundred sixty".