81363216 has 40 divisors (see below), whose sum is σ = 229297824. Its totient is φ = 24655360.

The previous prime is 81363211. The next prime is 81363221. The reversal of 81363216 is 61236318.

It is an interprime number because it is at equal distance from previous prime (81363211) and next prime (81363221).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (81363211) 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, 76521 + ... + 77576.

Almost surely, 2^81363216 is an apocalyptic number.

It is an amenable number.

81363216 is an abundant number, since it is smaller than the sum of its proper divisors (147934608).

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

81363216 is a wasteful number, since it uses less digits than its factorization.

81363216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154119 (or 154113 counting only the distinct ones).

The product of its digits is 5184, while the sum is 30.

The square root of 81363216 is about 9020.1560962103. The cubic root of 81363216 is about 433.3206328954.

The spelling of 81363216 in words is "eighty-one million, three hundred sixty-three thousand, two hundred sixteen".