81506032 has 20 divisors (see below), whose sum is σ = 161770896. Its totient is φ = 39758720.

The previous prime is 81505999. The next prime is 81506053. The reversal of 81506032 is 23060518.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81505988 and 81506006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61468 + ... + 62779.

Almost surely, 2^81506032 is an apocalyptic number.

81506032 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is an amenable number.

81506032 is a deficient number, since it is larger than the sum of its proper divisors (80264864).

81506032 is a wasteful number, since it uses less digits than its factorization.

81506032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124296 (or 124290 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 81506032 is about 9028.0691180340. The cubic root of 81506032 is about 433.5740190857.

The spelling of 81506032 in words is "eighty-one million, five hundred six thousand, thirty-two".