81042672 has 40 divisors (see below), whose sum is σ = 221677776. Its totient is φ = 25424896.

The previous prime is 81042667. The next prime is 81042697. The reversal of 81042672 is 27624018.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 48843 + ... + 50474.

Almost surely, 2^81042672 is an apocalyptic number.

It is an amenable number.

81042672 is an abundant number, since it is smaller than the sum of its proper divisors (140635104).

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

81042672 is a wasteful number, since it uses less digits than its factorization.

81042672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99345 (or 99339 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 81042672 is about 9002.3703545233. The cubic root of 81042672 is about 432.7508375977.

The spelling of 81042672 in words is "eighty-one million, forty-two thousand, six hundred seventy-two".