81497424 has 80 divisors (see below), whose sum is σ = 219985920. Its totient is φ = 25966080.

The previous prime is 81497417. The next prime is 81497431. The reversal of 81497424 is 42479418.

It is an interprime number because it is at equal distance from previous prime (81497417) and next prime (81497431).

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 176554 + ... + 177014.

It is an arithmetic number, because the mean of its divisors is an integer number (2749824).

Almost surely, 2^81497424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81497424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109992960).

81497424 is an abundant number, since it is smaller than the sum of its proper divisors (138488496).

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

81497424 is a wasteful number, since it uses less digits than its factorization.

81497424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628 (or 622 counting only the distinct ones).

The product of its digits is 64512, while the sum is 39.

The square root of 81497424 is about 9027.5923700619. The cubic root of 81497424 is about 433.5587550353.

The spelling of 81497424 in words is "eighty-one million, four hundred ninety-seven thousand, four hundred twenty-four".