81976158 has 32 divisors (see below), whose sum is σ = 198731520. Its totient is φ = 24841080.

The previous prime is 81976129. The next prime is 81976187. The reversal of 81976158 is 85167918.

It is an interprime number because it is at equal distance from previous prime (81976129) and next prime (81976187).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68410 + ... + 69597.

It is an arithmetic number, because the mean of its divisors is an integer number (6210360).

Almost surely, 2^81976158 is an apocalyptic number.

81976158 is an abundant number, since it is smaller than the sum of its proper divisors (116755362).

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

81976158 is a wasteful number, since it uses less digits than its factorization.

81976158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138029 (or 138023 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The square root of 81976158 is about 9054.0685882094. The cubic root of 81976158 is about 434.4060383459.

The spelling of 81976158 in words is "eighty-one million, nine hundred seventy-six thousand, one hundred fifty-eight".