81470619648 has 408 divisors, whose sum is σ = 266220929520. Its totient is φ = 23781703680.

The previous prime is 81470619641. The next prime is 81470619653. The reversal of 81470619648 is 84691607418.

81470619648 is a `hidden beast` number, since 8 + 14 + 7 + 0 + 619 + 6 + 4 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 81470619594 and 81470619603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81470619641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 188153640 + ... + 188154072.

Almost surely, 2^81470619648 is an apocalyptic number.

81470619648 is a gapful number since it is divisible by the number (88) 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 81470619648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133110464760).

81470619648 is an abundant number, since it is smaller than the sum of its proper divisors (184750309872).

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

81470619648 is a wasteful number, since it uses less digits than its factorization.

81470619648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511 (or 478 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The spelling of 81470619648 in words is "eighty-one billion, four hundred seventy million, six hundred nineteen thousand, six hundred forty-eight".