81976283 has 8 divisors (see below), whose sum is σ = 82736640. Its totient is φ = 81219880.

The previous prime is 81976277. The next prime is 81976291. The reversal of 81976283 is 38267918.

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 81976283 - 2⁴ = 81976267 is a prime.

It is a super-2 number, since 2×81976283² = 13440221948992178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81916283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53498 + ... + 55008.

It is an arithmetic number, because the mean of its divisors is an integer number (10342080).

Almost surely, 2^81976283 is an apocalyptic number.

81976283 is a deficient number, since it is larger than the sum of its proper divisors (760357).

81976283 is a wasteful number, since it uses less digits than its factorization.

81976283 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1977.

The product of its digits is 145152, while the sum is 44.

The square root of 81976283 is about 9054.0754911808. The cubic root of 81976283 is about 434.4062591448.

The spelling of 81976283 in words is "eighty-one million, nine hundred seventy-six thousand, two hundred eighty-three".