81677282 has 16 divisors (see below), whose sum is σ = 134197560. Its totient is φ = 37110528.

The previous prime is 81677263. The next prime is 81677287. The reversal of 81677282 is 28277618.

It can be written as a sum of positive squares in 4 ways, for example, as 54626881 + 27050401 = 7391^2 + 5201^2 .

It is not an unprimeable number, because it can be changed into a prime (81677287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40433 + ... + 42404.

Almost surely, 2^81677282 is an apocalyptic number.

81677282 is a deficient number, since it is larger than the sum of its proper divisors (52520278).

81677282 is a wasteful number, since it uses less digits than its factorization.

81677282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82885.

The product of its digits is 75264, while the sum is 41.

The square root of 81677282 is about 9037.5484507692. The cubic root of 81677282 is about 433.8774633354.

The spelling of 81677282 in words is "eighty-one million, six hundred seventy-seven thousand, two hundred eighty-two".