81946650 has 48 divisors (see below), whose sum is σ = 203781600. Its totient is φ = 21792960.

The previous prime is 81946649. The next prime is 81946651. The reversal of 81946650 is 5664918.

It is an interprime number because it is at equal distance from previous prime (81946649) and next prime (81946651).

It is a junction number, because it is equal to n+sod(n) for n = 81946599 and 81946608.

It is not an unprimeable number, because it can be changed into a prime (81946651) by changing a digit.

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 in 23 ways as a sum of consecutive naturals, for example, 98436 + ... + 99264.

It is an arithmetic number, because the mean of its divisors is an integer number (4245450).

Almost surely, 2^81946650 is an apocalyptic number.

81946650 is an abundant number, since it is smaller than the sum of its proper divisors (121834950).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81946650 is a wasteful number, since it uses less digits than its factorization.

81946650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1503 (or 1498 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 81946650 is about 9052.4388978882. The cubic root of 81946650 is about 434.3539094016.

The spelling of 81946650 in words is "eighty-one million, nine hundred forty-six thousand, six hundred fifty".