81372498 has 16 divisors (see below), whose sum is σ = 163010496. Its totient is φ = 27079920.

The previous prime is 81372481. The next prime is 81372503. The reversal of 81372498 is 89427318.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6961 + ... + 14532.

It is an arithmetic number, because the mean of its divisors is an integer number (10188156).

Almost surely, 2^81372498 is an apocalyptic number.

81372498 is an abundant number, since it is smaller than the sum of its proper divisors (81637998).

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

81372498 is a wasteful number, since it uses less digits than its factorization.

81372498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22129.

The product of its digits is 96768, while the sum is 42.

The square root of 81372498 is about 9020.6705959147. The cubic root of 81372498 is about 433.3371101577.

The spelling of 81372498 in words is "eighty-one million, three hundred seventy-two thousand, four hundred ninety-eight".