81627682 has 4 divisors (see below), whose sum is σ = 122441526. Its totient is φ = 40813840.

The previous prime is 81627677. The next prime is 81627683. The reversal of 81627682 is 28672618.

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., 56115081 + 25512601 = 7491^2 + 5051^2 .

It is not an unprimeable number, because it can be changed into a prime (81627683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20406919 + ... + 20406922.

Almost surely, 2^81627682 is an apocalyptic number.

81627682 is a deficient number, since it is larger than the sum of its proper divisors (40813844).

81627682 is a wasteful number, since it uses less digits than its factorization.

81627682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40813843.

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

The square root of 81627682 is about 9034.8039270368. The cubic root of 81627682 is about 433.7896189176.

The spelling of 81627682 in words is "eighty-one million, six hundred twenty-seven thousand, six hundred eighty-two".