81696626 has 8 divisors (see below), whose sum is σ = 133685424. Its totient is φ = 37134820.

The previous prime is 81696623. The next prime is 81696631. The reversal of 81696626 is 62669618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81696623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1856720 + ... + 1856763.

It is an arithmetic number, because the mean of its divisors is an integer number (16710678).

Almost surely, 2^81696626 is an apocalyptic number.

81696626 is a deficient number, since it is larger than the sum of its proper divisors (51988798).

81696626 is a wasteful number, since it uses less digits than its factorization.

81696626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3713496.

The product of its digits is 186624, while the sum is 44.

The square root of 81696626 is about 9038.6185891429. The cubic root of 81696626 is about 433.9117130188.

The spelling of 81696626 in words is "eighty-one million, six hundred ninety-six thousand, six hundred twenty-six".