81246650 has 12 divisors (see below), whose sum is σ = 151118862. Its totient is φ = 32498640.

The previous prime is 81246647. The next prime is 81246667. The reversal of 81246650 is 5664218.

It can be written as a sum of positive squares in 3 ways, for example, as 70677649 + 10569001 = 8407^2 + 3251^2 .

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 in 5 ways as a sum of consecutive naturals, for example, 812417 + ... + 812516.

Almost surely, 2^81246650 is an apocalyptic number.

81246650 is a deficient number, since it is larger than the sum of its proper divisors (69872212).

81246650 is a wasteful number, since it uses less digits than its factorization.

81246650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1624945 (or 1624940 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 81246650 is about 9013.6923621788. The cubic root of 81246650 is about 433.1135999712.

The spelling of 81246650 in words is "eighty-one million, two hundred forty-six thousand, six hundred fifty".