68442530 has 32 divisors (see below), whose sum is σ = 135919728. Its totient is φ = 24652800.

The previous prime is 68442499. The next prime is 68442533. The reversal of 68442530 is 3524486.

It is a Cunningham number, because it is equal to 8273²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 3301489 + 65141041 = 1817^2 + 8071^2 .

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (68442533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1091 + ... + 11750.

Almost surely, 2^68442530 is an apocalyptic number.

68442530 is a deficient number, since it is larger than the sum of its proper divisors (67477198).

68442530 is a wasteful number, since it uses less digits than its factorization.

68442530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12902.

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 68442530 is about 8273.0000604376. Note that the first 4 decimals coincide. The cubic root of 68442530 is about 409.0490154331.

The spelling of 68442530 in words is "sixty-eight million, four hundred forty-two thousand, five hundred thirty".