81267682 has 4 divisors (see below), whose sum is σ = 121901526. Its totient is φ = 40633840.

The previous prime is 81267673. The next prime is 81267689. The reversal of 81267682 is 28676218.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28676218 = 2 ⋅14338109.

It can be written as a sum of positive squares in only one way, i.e., 50253921 + 31013761 = 7089^2 + 5569^2 .

It is a super-2 number, since 2×81267682² = 13208872275306248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81267689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20316919 + ... + 20316922.

Almost surely, 2^81267682 is an apocalyptic number.

81267682 is a deficient number, since it is larger than the sum of its proper divisors (40633844).

81267682 is a wasteful number, since it uses less digits than its factorization.

81267682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40633843.

The product of its digits is 64512, while the sum is 40.

The square root of 81267682 is about 9014.8589561901. The cubic root of 81267682 is about 433.1509695502.

The spelling of 81267682 in words is "eighty-one million, two hundred sixty-seven thousand, six hundred eighty-two".