81283608 has 64 divisors (see below), whose sum is σ = 258048000. Its totient is φ = 23223456.

The previous prime is 81283603. The next prime is 81283619. The reversal of 81283608 is 80638218.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81283603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25368 + ... + 28391.

It is an arithmetic number, because the mean of its divisors is an integer number (4032000).

Almost surely, 2^81283608 is an apocalyptic number.

It is an amenable number.

81283608 is an abundant number, since it is smaller than the sum of its proper divisors (176764392).

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

81283608 is a wasteful number, since it uses less digits than its factorization.

81283608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53781 (or 53771 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 81283608 is about 9015.7422323401. The cubic root of 81283608 is about 433.1792625182.

The spelling of 81283608 in words is "eighty-one million, two hundred eighty-three thousand, six hundred eight".