68990353 has 4 divisors (see below), whose sum is σ = 69429940. Its totient is φ = 68550768.

The previous prime is 68990297. The next prime is 68990357. The reversal of 68990353 is 35309986.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43467649 + 25522704 = 6593^2 + 5052^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68990353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68990357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219558 + ... + 219871.

It is an arithmetic number, because the mean of its divisors is an integer number (17357485).

Almost surely, 2^68990353 is an apocalyptic number.

It is an amenable number.

68990353 is a deficient number, since it is larger than the sum of its proper divisors (439587).

68990353 is a wasteful number, since it uses less digits than its factorization.

68990353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439586.

The product of its (nonzero) digits is 174960, while the sum is 43.

The square root of 68990353 is about 8306.0431614578. The cubic root of 68990353 is about 410.1374771970.

The spelling of 68990353 in words is "sixty-eight million, nine hundred ninety thousand, three hundred fifty-three".