81976282 has 4 divisors (see below), whose sum is σ = 122964426. Its totient is φ = 40988140.

The previous prime is 81976277. The next prime is 81976291. The reversal of 81976282 is 28267918.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 75325041 + 6651241 = 8679^2 + 2579^2 .

It is a super-2 number, since 2×81976282² = 13440221621087048, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20494069 + ... + 20494072.

Almost surely, 2^81976282 is an apocalyptic number.

81976282 is a deficient number, since it is larger than the sum of its proper divisors (40988144).

81976282 is a wasteful number, since it uses less digits than its factorization.

81976282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40988143.

The product of its digits is 96768, while the sum is 43.

The square root of 81976282 is about 9054.0754359570. The cubic root of 81976282 is about 434.4062573784.

The spelling of 81976282 in words is "eighty-one million, nine hundred seventy-six thousand, two hundred eighty-two".