81587714 has 16 divisors (see below), whose sum is σ = 133031808. Its totient is φ = 37302672.

The previous prime is 81587713. The next prime is 81587731. The reversal of 81587714 is 41778518.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81587713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11882 + ... + 17445.

It is an arithmetic number, because the mean of its divisors is an integer number (8314488).

Almost surely, 2^81587714 is an apocalyptic number.

81587714 is a deficient number, since it is larger than the sum of its proper divisors (51444094).

81587714 is a wasteful number, since it uses less digits than its factorization.

81587714 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29449.

The product of its digits is 62720, while the sum is 41.

The square root of 81587714 is about 9032.5917653794. The cubic root of 81587714 is about 433.7188074250.

The spelling of 81587714 in words is "eighty-one million, five hundred eighty-seven thousand, seven hundred fourteen".