81654446 has 4 divisors (see below), whose sum is σ = 122481672. Its totient is φ = 40827222.

The previous prime is 81654437. The next prime is 81654467. The reversal of 81654446 is 64445618.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20413610 + ... + 20413613.

It is an arithmetic number, because the mean of its divisors is an integer number (30620418).

Almost surely, 2^81654446 is an apocalyptic number.

81654446 is a deficient number, since it is larger than the sum of its proper divisors (40827226).

81654446 is a wasteful number, since it uses less digits than its factorization.

81654446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40827225.

The product of its digits is 92160, while the sum is 38.

The square root of 81654446 is about 9036.2849667327. The cubic root of 81654446 is about 433.8370239009.

The spelling of 81654446 in words is "eighty-one million, six hundred fifty-four thousand, four hundred forty-six".