81470277287 has 32 divisors (see below), whose sum is σ = 97758228480. Its totient is φ = 66383349120.

The previous prime is 81470277209. The next prime is 81470277311. The reversal of 81470277287 is 78277207418.

It is a cyclic number.

It is not a de Polignac number, because 81470277287 - 2³⁰ = 80396535463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81470271287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24368738 + ... + 24372080.

It is an arithmetic number, because the mean of its divisors is an integer number (3054944640).

Almost surely, 2^81470277287 is an apocalyptic number.

81470277287 is a deficient number, since it is larger than the sum of its proper divisors (16287951193).

81470277287 is a wasteful number, since it uses less digits than its factorization.

81470277287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4263.

The product of its (nonzero) digits is 2458624, while the sum is 53.

The spelling of 81470277287 in words is "eighty-one billion, four hundred seventy million, two hundred seventy-seven thousand, two hundred eighty-seven".