81446936 has 8 divisors (see below), whose sum is σ = 152713020. Its totient is φ = 40723464.

The previous prime is 81446929. The next prime is 81446947. The reversal of 81446936 is 63964418.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 81446893 and 81446902.

It is a congruent number.

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, 5090426 + ... + 5090441.

Almost surely, 2^81446936 is an apocalyptic number.

It is an amenable number.

81446936 is a deficient number, since it is larger than the sum of its proper divisors (71266084).

81446936 is a wasteful number, since it uses less digits than its factorization.

81446936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10180873 (or 10180869 counting only the distinct ones).

The product of its digits is 124416, while the sum is 41.

The square root of 81446936 is about 9024.7956209545. The cubic root of 81446936 is about 433.4692060445.

The spelling of 81446936 in words is "eighty-one million, four hundred forty-six thousand, nine hundred thirty-six".