81963898 has 16 divisors (see below), whose sum is σ = 124952256. Its totient is φ = 40318560.

The previous prime is 81963877. The next prime is 81963899. The reversal of 81963898 is 89836918.

It is not an unprimeable number, because it can be changed into a prime (81963899) 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, 32358 + ... + 34798.

It is an arithmetic number, because the mean of its divisors is an integer number (7809516).

Almost surely, 2^81963898 is an apocalyptic number.

81963898 is a deficient number, since it is larger than the sum of its proper divisors (42988358).

81963898 is a wasteful number, since it uses less digits than its factorization.

81963898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2709.

The product of its digits is 746496, while the sum is 52.

The square root of 81963898 is about 9053.3915192043. The cubic root of 81963898 is about 434.3843813028.

The spelling of 81963898 in words is "eighty-one million, nine hundred sixty-three thousand, eight hundred ninety-eight".