81726697 has 8 divisors (see below), whose sum is σ = 89074944. Its totient is φ = 74530128.

The previous prime is 81726691. The next prime is 81726731. The reversal of 81726697 is 79662718.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81726697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81726691) 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, 36793 + ... + 38950.

It is an arithmetic number, because the mean of its divisors is an integer number (11134368).

Almost surely, 2^81726697 is an apocalyptic number.

It is an amenable number.

81726697 is a deficient number, since it is larger than the sum of its proper divisors (7348247).

81726697 is a wasteful number, since it uses less digits than its factorization.

81726697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75839.

The product of its digits is 254016, while the sum is 46.

The square root of 81726697 is about 9040.2819093212. The cubic root of 81726697 is about 433.9649447501.

The spelling of 81726697 in words is "eighty-one million, seven hundred twenty-six thousand, six hundred ninety-seven".