81212888 has 16 divisors (see below), whose sum is σ = 153783360. Its totient is φ = 40204000.

The previous prime is 81212863. The next prime is 81212933. The reversal of 81212888 is 88821218.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49448 + ... + 51063.

It is an arithmetic number, because the mean of its divisors is an integer number (9611460).

Almost surely, 2^81212888 is an apocalyptic number.

It is an amenable number.

81212888 is a deficient number, since it is larger than the sum of its proper divisors (72570472).

81212888 is a wasteful number, since it uses less digits than its factorization.

81212888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100618 (or 100614 counting only the distinct ones).

The product of its digits is 16384, while the sum is 38.

The square root of 81212888 is about 9011.8193501645. The cubic root of 81212888 is about 433.0535982877.

The spelling of 81212888 in words is "eighty-one million, two hundred twelve thousand, eight hundred eighty-eight".