81227364 has 12 divisors (see below), whose sum is σ = 189530544. Its totient is φ = 27075784.

The previous prime is 81227359. The next prime is 81227371. The reversal of 81227364 is 46372218.

It is a tau number, because it is divible by the number of its divisors (12).

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, 3384462 + ... + 3384485.

It is an arithmetic number, because the mean of its divisors is an integer number (15794212).

Almost surely, 2^81227364 is an apocalyptic number.

It is an amenable number.

81227364 is an abundant number, since it is smaller than the sum of its proper divisors (108303180).

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

81227364 is a wasteful number, since it uses less digits than its factorization.

81227364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6768954 (or 6768952 counting only the distinct ones).

The product of its digits is 16128, while the sum is 33.

The square root of 81227364 is about 9012.6224818307. The cubic root of 81227364 is about 433.0793270097.

The spelling of 81227364 in words is "eighty-one million, two hundred twenty-seven thousand, three hundred sixty-four".