81730324 has 24 divisors (see below), whose sum is σ = 162139040. Its totient is φ = 35735904.

The previous prime is 81730309. The next prime is 81730331. The reversal of 81730324 is 42303718.

It is a super-2 number, since 2×81730324² = 13359691722289952, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81730292 and 81730301.

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, 40374 + ... + 42349.

Almost surely, 2^81730324 is an apocalyptic number.

It is an amenable number.

81730324 is a deficient number, since it is larger than the sum of its proper divisors (80408716).

81730324 is a wasteful number, since it uses less digits than its factorization.

81730324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82759 (or 82757 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 81730324 is about 9040.4825092469. The cubic root of 81730324 is about 433.9713643887.

The spelling of 81730324 in words is "eighty-one million, seven hundred thirty thousand, three hundred twenty-four".