81642614 has 4 divisors (see below), whose sum is σ = 122463924. Its totient is φ = 40821306.

The previous prime is 81642611. The next prime is 81642697. The reversal of 81642614 is 41624618.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81642611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20410652 + ... + 20410655.

It is an arithmetic number, because the mean of its divisors is an integer number (30615981).

Almost surely, 2^81642614 is an apocalyptic number.

81642614 is a deficient number, since it is larger than the sum of its proper divisors (40821310).

81642614 is a wasteful number, since it uses less digits than its factorization.

81642614 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40821309.

The product of its digits is 9216, while the sum is 32.

The square root of 81642614 is about 9035.6302491857. The cubic root of 81642614 is about 433.8160680809.

The spelling of 81642614 in words is "eighty-one million, six hundred forty-two thousand, six hundred fourteen".