68981650 has 12 divisors (see below), whose sum is σ = 128305962. Its totient is φ = 27592640.

The previous prime is 68981629. The next prime is 68981651. The reversal of 68981650 is 5618986.

It can be written as a sum of positive squares in 3 ways, for example, as 38278969 + 30702681 = 6187^2 + 5541^2 .

It is a junction number, because it is equal to n+sod(n) for n = 68981597 and 68981606.

It is not an unprimeable number, because it can be changed into a prime (68981651) 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 5 ways as a sum of consecutive naturals, for example, 689767 + ... + 689866.

Almost surely, 2^68981650 is an apocalyptic number.

68981650 is a deficient number, since it is larger than the sum of its proper divisors (59324312).

68981650 is a wasteful number, since it uses less digits than its factorization.

68981650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1379645 (or 1379640 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 68981650 is about 8305.5192492703. The cubic root of 68981650 is about 410.1202304544.

The spelling of 68981650 in words is "sixty-eight million, nine hundred eighty-one thousand, six hundred fifty".