81946310 has 8 divisors (see below), whose sum is σ = 147503376. Its totient is φ = 32778520.

The previous prime is 81946303. The next prime is 81946313. The reversal of 81946310 is 1364918.

It is a happy number.

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

It is a super-2 number, since 2×81946310² = 13430395445232200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81946313) by changing a digit.

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, 4097306 + ... + 4097325.

It is an arithmetic number, because the mean of its divisors is an integer number (18437922).

Almost surely, 2^81946310 is an apocalyptic number.

81946310 is a deficient number, since it is larger than the sum of its proper divisors (65557066).

81946310 is a wasteful number, since it uses less digits than its factorization.

81946310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8194638.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 81946310 is about 9052.4201183993. The cubic root of 81946310 is about 434.3533086834.

The spelling of 81946310 in words is "eighty-one million, nine hundred forty-six thousand, three hundred ten".