81472646 has 12 divisors (see below), whose sum is σ = 128980692. Its totient is φ = 38591964.

The previous prime is 81472639. The next prime is 81472663. The reversal of 81472646 is 64627418.

It is a Harshad number since it is a multiple of its sum of digits (38).

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 5 ways as a sum of consecutive naturals, for example, 55700 + ... + 57143.

It is an arithmetic number, because the mean of its divisors is an integer number (10748391).

Almost surely, 2^81472646 is an apocalyptic number.

81472646 is a deficient number, since it is larger than the sum of its proper divisors (47508046).

81472646 is a wasteful number, since it uses less digits than its factorization.

81472646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112883 (or 112864 counting only the distinct ones).

The product of its digits is 64512, while the sum is 38.

The square root of 81472646 is about 9026.2199175513. The cubic root of 81472646 is about 433.5148116924.

The spelling of 81472646 in words is "eighty-one million, four hundred seventy-two thousand, six hundred forty-six".