81203966 has 8 divisors (see below), whose sum is σ = 122198544. Its totient is φ = 40471120.

The previous prime is 81203953. The next prime is 81203981. The reversal of 81203966 is 66930218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64655 + ... + 65898.

It is an arithmetic number, because the mean of its divisors is an integer number (15274818).

Almost surely, 2^81203966 is an apocalyptic number.

81203966 is a deficient number, since it is larger than the sum of its proper divisors (40994578).

81203966 is a wasteful number, since it uses less digits than its factorization.

81203966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130866.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 81203966 is about 9011.3243199876. The cubic root of 81203966 is about 433.0377393693.

The spelling of 81203966 in words is "eighty-one million, two hundred three thousand, nine hundred sixty-six".