81363612 has 24 divisors (see below), whose sum is σ = 207107712. Its totient is φ = 24655600.

The previous prime is 81363599. The next prime is 81363617. The reversal of 81363612 is 21636318.

It is a self number, because there is not a number n which added to its sum of digits gives 81363612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81363617) 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, 308064 + ... + 308327.

It is an arithmetic number, because the mean of its divisors is an integer number (8629488).

Almost surely, 2^81363612 is an apocalyptic number.

It is an amenable number.

81363612 is an abundant number, since it is smaller than the sum of its proper divisors (125744100).

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

81363612 is a wasteful number, since it uses less digits than its factorization.

81363612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616409 (or 616407 counting only the distinct ones).

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

The square root of 81363612 is about 9020.1780470232. The cubic root of 81363612 is about 433.3213358940.

The spelling of 81363612 in words is "eighty-one million, three hundred sixty-three thousand, six hundred twelve".