81063787 has 12 divisors (see below), whose sum is σ = 97552080. Its totient is φ = 67086096.

The previous prime is 81063761. The next prime is 81063793. The reversal of 81063787 is 78736018.

It is a de Polignac number, because none of the positive numbers 2^k-81063787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81063757) 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 11 ways as a sum of consecutive naturals, for example, 27103 + ... + 29944.

It is an arithmetic number, because the mean of its divisors is an integer number (8129340).

Almost surely, 2^81063787 is an apocalyptic number.

81063787 is a deficient number, since it is larger than the sum of its proper divisors (16488293).

81063787 is a wasteful number, since it uses less digits than its factorization.

81063787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57090 (or 57083 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 81063787 is about 9003.5430248319. The cubic root of 81063787 is about 432.7884175551.

The spelling of 81063787 in words is "eighty-one million, sixty-three thousand, seven hundred eighty-seven".