81000698 has 8 divisors (see below), whose sum is σ = 121632192. Its totient is φ = 40456636.

The previous prime is 81000697. The next prime is 81000709. The reversal of 81000698 is 89600018.

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

It is a super-2 number, since 2×81000698² = 13122226152974408, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81000697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19490 + ... + 23277.

It is an arithmetic number, because the mean of its divisors is an integer number (15204024).

Almost surely, 2^81000698 is an apocalyptic number.

81000698 is a deficient number, since it is larger than the sum of its proper divisors (40631494).

81000698 is a wasteful number, since it uses less digits than its factorization.

81000698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43716.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 81000698 is about 9000.0387776942. The cubic root of 81000698 is about 432.6761139161.

The spelling of 81000698 in words is "eighty-one million, six hundred ninety-eight", and thus it is an aban number.