81740886 has 12 divisors (see below), whose sum is σ = 163526076. Its totient is φ = 27239580.

The previous prime is 81740861. The next prime is 81740891. The reversal of 81740886 is 68804718.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20301 + ... + 23991.

It is an arithmetic number, because the mean of its divisors is an integer number (13627173).

Almost surely, 2^81740886 is an apocalyptic number.

81740886 is an abundant number, since it is smaller than the sum of its proper divisors (81785190).

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

81740886 is an frugal number, since it uses more digits than its factorization.

81740886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7387 (or 3696 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 42.

The square root of 81740886 is about 9041.0666406127. The cubic root of 81740886 is about 433.9900576060.

The spelling of 81740886 in words is "eighty-one million, seven hundred forty thousand, eight hundred eighty-six".