68690458 has 4 divisors (see below), whose sum is σ = 103035690. Its totient is φ = 34345228.

The previous prime is 68690449. The next prime is 68690471. The reversal of 68690458 is 85409686.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85409686 = 2 ⋅42704843.

It can be written as a sum of positive squares in only one way, i.e., 68608089 + 82369 = 8283^2 + 287^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17172613 + ... + 17172616.

Almost surely, 2^68690458 is an apocalyptic number.

68690458 is a deficient number, since it is larger than the sum of its proper divisors (34345232).

68690458 is a wasteful number, since it uses less digits than its factorization.

68690458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34345231.

The product of its (nonzero) digits is 414720, while the sum is 46.

The square root of 68690458 is about 8287.9706804501. The cubic root of 68690458 is about 409.5423368342.

The spelling of 68690458 in words is "sixty-eight million, six hundred ninety thousand, four hundred fifty-eight".