81797424 has 40 divisors (see below), whose sum is σ = 212746800. Its totient is φ = 27080448.

The previous prime is 81797411. The next prime is 81797431. The reversal of 81797424 is 42479718.

It is a happy 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, 1434 + ... + 12870.

It is an arithmetic number, because the mean of its divisors is an integer number (5318670).

Almost surely, 2^81797424 is an apocalyptic number.

It is an amenable number.

81797424 is an abundant number, since it is smaller than the sum of its proper divisors (130949376).

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

81797424 is a wasteful number, since it uses less digits than its factorization.

81797424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11597 (or 11591 counting only the distinct ones).

The product of its digits is 112896, while the sum is 42.

The square root of 81797424 is about 9044.1928329730. The cubic root of 81797424 is about 434.0900943443.

The spelling of 81797424 in words is "eighty-one million, seven hundred ninety-seven thousand, four hundred twenty-four".