81635368 has 16 divisors (see below), whose sum is σ = 153302580. Its totient is φ = 40754688.

The previous prime is 81635347. The next prime is 81635383. The reversal of 81635368 is 86353618.

It can be written as a sum of positive squares in 2 ways, for example, as 72284004 + 9351364 = 8502^2 + 3058^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81635368.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2121 + ... + 12952.

Almost surely, 2^81635368 is an apocalyptic number.

It is an amenable number.

81635368 is a deficient number, since it is larger than the sum of its proper divisors (71667212).

81635368 is a wasteful number, since it uses less digits than its factorization.

81635368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15756 (or 15752 counting only the distinct ones).

The product of its digits is 103680, while the sum is 40.

The square root of 81635368 is about 9035.2292721325. The cubic root of 81635368 is about 433.8032335897.

It can be divided in two parts, 8163 and 5368, that added together give a palindrome (13531).

The spelling of 81635368 in words is "eighty-one million, six hundred thirty-five thousand, three hundred sixty-eight".