81234064 has 10 divisors (see below), whose sum is σ = 157391030. Its totient is φ = 40617024.

The previous prime is 81234059. The next prime is 81234071. The reversal of 81234064 is 46043218.

It can be written as a sum of positive squares in only one way, i.e., 81144064 + 90000 = 9008^2 + 300^2 .

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 as a sum of consecutive naturals, namely, 2538549 + ... + 2538580.

It is an arithmetic number, because the mean of its divisors is an integer number (15739103).

Almost surely, 2^81234064 is an apocalyptic number.

It is an amenable number.

81234064 is a deficient number, since it is larger than the sum of its proper divisors (76156966).

81234064 is a wasteful number, since it uses less digits than its factorization.

81234064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5077137 (or 5077131 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 81234064 is about 9012.9941750786. The cubic root of 81234064 is about 433.0912341289.

The spelling of 81234064 in words is "eighty-one million, two hundred thirty-four thousand, sixty-four".