81267384 has 32 divisors (see below), whose sum is σ = 221639040. Its totient is φ = 24626400.

The previous prime is 81267383. The next prime is 81267419. The reversal of 81267384 is 48376218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81267383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153652 + ... + 154179.

It is an arithmetic number, because the mean of its divisors is an integer number (6926220).

Almost surely, 2^81267384 is an apocalyptic number.

It is an amenable number.

81267384 is an abundant number, since it is smaller than the sum of its proper divisors (140371656).

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

81267384 is a wasteful number, since it uses less digits than its factorization.

81267384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307851 (or 307847 counting only the distinct ones).

The product of its digits is 64512, while the sum is 39.

The square root of 81267384 is about 9014.8424279074. The cubic root of 81267384 is about 433.1504401100.

The spelling of 81267384 in words is "eighty-one million, two hundred sixty-seven thousand, three hundred eighty-four".