81726732 has 42 divisors (see below), whose sum is σ = 214442228. Its totient is φ = 27241272.

The previous prime is 81726731. The next prime is 81726737. The reversal of 81726732 is 23762718.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (81726731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 11098 + ... + 16929.

Almost surely, 2^81726732 is an apocalyptic number.

It is an amenable number.

81726732 is an abundant number, since it is smaller than the sum of its proper divisors (132715496).

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

81726732 is a wasteful number, since it uses less digits than its factorization.

81726732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28049 (or 28032 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 81726732 is about 9040.2838451013. The cubic root of 81726732 is about 433.9650066996.

The spelling of 81726732 in words is "eighty-one million, seven hundred twenty-six thousand, seven hundred thirty-two".