81648064 has 14 divisors (see below), whose sum is σ = 162020504. Its totient is φ = 40824000.

The previous prime is 81648053. The next prime is 81648067. The reversal of 81648064 is 46084618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81648067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 637812 + ... + 637939.

Almost surely, 2^81648064 is an apocalyptic number.

It is an amenable number.

81648064 is a deficient number, since it is larger than the sum of its proper divisors (80372440).

81648064 is a wasteful number, since it uses less digits than its factorization.

81648064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1275763 (or 1275753 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 81648064 is about 9035.9318279854. The cubic root of 81648064 is about 433.8257209033.

The spelling of 81648064 in words is "eighty-one million, six hundred forty-eight thousand, sixty-four".