81222748 has 12 divisors (see below), whose sum is σ = 142205112. Its totient is φ = 40592720.

The previous prime is 81222703. The next prime is 81222797. The reversal of 81222748 is 84722218.

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, 10911 + ... + 16777.

It is an arithmetic number, because the mean of its divisors is an integer number (11850426).

Almost surely, 2^81222748 is an apocalyptic number.

It is an amenable number.

81222748 is a deficient number, since it is larger than the sum of its proper divisors (60982364).

81222748 is a wasteful number, since it uses less digits than its factorization.

81222748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9332 (or 9330 counting only the distinct ones).

The product of its digits is 14336, while the sum is 34.

The square root of 81222748 is about 9012.3663929070. The cubic root of 81222748 is about 433.0711231568.

The spelling of 81222748 in words is "eighty-one million, two hundred twenty-two thousand, seven hundred forty-eight".