81211088 has 20 divisors (see below), whose sum is σ = 179824800. Its totient is φ = 34804704.

The previous prime is 81211087. The next prime is 81211147. The reversal of 81211088 is 88011218.

It is a self number, because there is not a number n which added to its sum of digits gives 81211088.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81211087) 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, 362438 + ... + 362661.

It is an arithmetic number, because the mean of its divisors is an integer number (8991240).

Almost surely, 2^81211088 is an apocalyptic number.

It is an amenable number.

81211088 is an abundant number, since it is smaller than the sum of its proper divisors (98613712).

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

81211088 is a wasteful number, since it uses less digits than its factorization.

81211088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725114 (or 725108 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 29.

The square root of 81211088 is about 9011.7194807650. The cubic root of 81211088 is about 433.0503988685.

The spelling of 81211088 in words is "eighty-one million, two hundred eleven thousand, eighty-eight".