81343787 has 8 divisors (see below), whose sum is σ = 93033696. Its totient is φ = 69671232.

The previous prime is 81343771. The next prime is 81343849. The reversal of 81343787 is 78734318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81343787 - 2⁴ = 81343771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81343747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8093 + ... + 15105.

It is an arithmetic number, because the mean of its divisors is an integer number (11629212).

Almost surely, 2^81343787 is an apocalyptic number.

81343787 is a deficient number, since it is larger than the sum of its proper divisors (11689909).

81343787 is a wasteful number, since it uses less digits than its factorization.

81343787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8677.

The product of its digits is 112896, while the sum is 41.

The square root of 81343787 is about 9019.0790549812. The cubic root of 81343787 is about 433.2861387787.

The spelling of 81343787 in words is "eighty-one million, three hundred forty-three thousand, seven hundred eighty-seven".