81976998 has 16 divisors (see below), whose sum is σ = 164079936. Its totient is φ = 27304680.

The previous prime is 81976981. The next prime is 81977003. The reversal of 81976998 is 89967918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4653 + ... + 13623.

It is an arithmetic number, because the mean of its divisors is an integer number (10254996).

Almost surely, 2^81976998 is an apocalyptic number.

81976998 is an abundant number, since it is smaller than the sum of its proper divisors (82102938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81976998 is a wasteful number, since it uses less digits than its factorization.

81976998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10499.

The product of its digits is 1959552, while the sum is 57.

The square root of 81976998 is about 9054.1149760758. The cubic root of 81976998 is about 434.4075221099.

The spelling of 81976998 in words is "eighty-one million, nine hundred seventy-six thousand, nine hundred ninety-eight".