81263724 has 24 divisors (see below), whose sum is σ = 191296560. Its totient is φ = 26847744.

The previous prime is 81263719. The next prime is 81263731. The reversal of 81263724 is 42736218.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28609 + ... + 31320.

It is an arithmetic number, because the mean of its divisors is an integer number (7970690).

Almost surely, 2^81263724 is an apocalyptic number.

It is an amenable number.

81263724 is an abundant number, since it is smaller than the sum of its proper divisors (110032836).

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

81263724 is a wasteful number, since it uses less digits than its factorization.

81263724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60049 (or 60047 counting only the distinct ones).

The product of its digits is 16128, while the sum is 33.

The square root of 81263724 is about 9014.6394270653. The cubic root of 81263724 is about 433.1439374832.

The spelling of 81263724 in words is "eighty-one million, two hundred sixty-three thousand, seven hundred twenty-four".