81133624 has 32 divisors (see below), whose sum is σ = 178723440. Its totient is φ = 34041600.

The previous prime is 81133601. The next prime is 81133631. The reversal of 81133624 is 42633118.

It is a junction number, because it is equal to n+sod(n) for n = 81133592 and 81133601.

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, 34317 + ... + 36604.

Almost surely, 2^81133624 is an apocalyptic number.

It is an amenable number.

81133624 is an abundant number, since it is smaller than the sum of its proper divisors (97589816).

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

81133624 is a wasteful number, since it uses less digits than its factorization.

81133624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70951 (or 70947 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The square root of 81133624 is about 9007.4204964574. The cubic root of 81133624 is about 432.9126652634.

The spelling of 81133624 in words is "eighty-one million, one hundred thirty-three thousand, six hundred twenty-four".