81837238 has 16 divisors (see below), whose sum is σ = 141606144. Its totient is φ = 34744680.

The previous prime is 81837233. The next prime is 81837257. The reversal of 81837238 is 83273818.

It is a self number, because there is not a number n which added to its sum of digits gives 81837238.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81837233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25818 + ... + 28813.

It is an arithmetic number, because the mean of its divisors is an integer number (8850384).

Almost surely, 2^81837238 is an apocalyptic number.

81837238 is a deficient number, since it is larger than the sum of its proper divisors (59768906).

81837238 is a wasteful number, since it uses less digits than its factorization.

81837238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54747.

The product of its digits is 64512, while the sum is 40.

The square root of 81837238 is about 9046.3936460890. The cubic root of 81837238 is about 434.1605124530.

The spelling of 81837238 in words is "eighty-one million, eight hundred thirty-seven thousand, two hundred thirty-eight".