81494648 has 16 divisors (see below), whose sum is σ = 160845000. Its totient is φ = 38602656.

The previous prime is 81494603. The next prime is 81494653. The reversal of 81494648 is 84649418.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 81494599 and 81494608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267923 + ... + 268226.

Almost surely, 2^81494648 is an apocalyptic number.

It is an amenable number.

81494648 is a deficient number, since it is larger than the sum of its proper divisors (79350352).

81494648 is a wasteful number, since it uses less digits than its factorization.

81494648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536174 (or 536170 counting only the distinct ones).

The product of its digits is 221184, while the sum is 44.

The square root of 81494648 is about 9027.4386179026. The cubic root of 81494648 is about 433.5538322916.

The spelling of 81494648 in words is "eighty-one million, four hundred ninety-four thousand, six hundred forty-eight".