81986076 has 36 divisors (see below), whose sum is σ = 216255312. Its totient is φ = 26140224.

The previous prime is 81986059. The next prime is 81986077. The reversal of 81986076 is 67068918.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81986077) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48681 + ... + 50336.

It is an arithmetic number, because the mean of its divisors is an integer number (6007092).

Almost surely, 2^81986076 is an apocalyptic number.

It is an amenable number.

81986076 is an abundant number, since it is smaller than the sum of its proper divisors (134269236).

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

81986076 is a wasteful number, since it uses less digits than its factorization.

81986076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99050 (or 99045 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 81986076 is about 9054.6162812126. The cubic root of 81986076 is about 434.4235567132.

The spelling of 81986076 in words is "eighty-one million, nine hundred eighty-six thousand, seventy-six".