81335650 has 48 divisors (see below), whose sum is σ = 174765600. Its totient is φ = 27833600.

The previous prime is 81335629. The next prime is 81335669. The reversal of 81335650 is 5653318.

It is a super-4 number, since 4×81335650⁴ (a number of 33 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5001 + ... + 13699.

It is an arithmetic number, because the mean of its divisors is an integer number (3640950).

Almost surely, 2^81335650 is an apocalyptic number.

81335650 is an abundant number, since it is smaller than the sum of its proper divisors (93429950).

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

81335650 is a wasteful number, since it uses less digits than its factorization.

81335650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8739 (or 8734 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 81335650 is about 9018.6279444270. The cubic root of 81335650 is about 433.2716907714.

Adding to 81335650 its reverse (5653318), we get a palindrome (86988968).

It can be divided in two parts, 813 and 35650, that added together give a palindrome (36463).

The spelling of 81335650 in words is "eighty-one million, three hundred thirty-five thousand, six hundred fifty".