81045608 has 24 divisors (see below), whose sum is σ = 176771250. Its totient is φ = 34733664.

The previous prime is 81045589. The next prime is 81045631. The reversal of 81045608 is 80654018.

It can be written as a sum of positive squares in only one way, i.e., 81036004 + 9604 = 9002^2 + 98^2 .

It is a nialpdrome in base 14.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 102983 + ... + 103766.

Almost surely, 2^81045608 is an apocalyptic number.

It is an amenable number.

81045608 is an abundant number, since it is smaller than the sum of its proper divisors (95725642).

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

81045608 is a wasteful number, since it uses less digits than its factorization.

81045608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206769 (or 206758 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 81045608 is about 9002.5334212098. The cubic root of 81045608 is about 432.7560634090.

The spelling of 81045608 in words is "eighty-one million, forty-five thousand, six hundred eight".