81648912 has 20 divisors (see below), whose sum is σ = 210926480. Its totient is φ = 27216288.

The previous prime is 81648911. The next prime is 81648913. The reversal of 81648912 is 21984618.

It is an interprime number because it is at equal distance from previous prime (81648911) and next prime (81648913).

It is not an unprimeable number, because it can be changed into a prime (81648911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 850462 + ... + 850557.

It is an arithmetic number, because the mean of its divisors is an integer number (10546324).

Almost surely, 2^81648912 is an apocalyptic number.

It is an amenable number.

81648912 is an abundant number, since it is smaller than the sum of its proper divisors (129277568).

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

81648912 is a wasteful number, since it uses less digits than its factorization.

81648912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1701030 (or 1701024 counting only the distinct ones).

The product of its digits is 27648, while the sum is 39.

The square root of 81648912 is about 9035.9787516350. The cubic root of 81648912 is about 433.8272228084.

The spelling of 81648912 in words is "eighty-one million, six hundred forty-eight thousand, nine hundred twelve".