81500632 has 16 divisors (see below), whose sum is σ = 156065760. Its totient is φ = 39883104.

The previous prime is 81500623. The next prime is 81500641. The reversal of 81500632 is 23600518.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81500623) and next prime (81500641).

It is a junction number, because it is equal to n+sod(n) for n = 81500597 and 81500606.

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, 108003 + ... + 108754.

It is an arithmetic number, because the mean of its divisors is an integer number (9754110).

Almost surely, 2^81500632 is an apocalyptic number.

It is an amenable number.

81500632 is a deficient number, since it is larger than the sum of its proper divisors (74565128).

81500632 is a wasteful number, since it uses less digits than its factorization.

81500632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216810 (or 216806 counting only the distinct ones).

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

The square root of 81500632 is about 9027.7700458087. The cubic root of 81500632 is about 433.5644437150.

The spelling of 81500632 in words is "eighty-one million, five hundred thousand, six hundred thirty-two".