68454989 has 4 divisors (see below), whose sum is σ = 68607900. Its totient is φ = 68302080.

The previous prime is 68454961. The next prime is 68455007. The reversal of 68454989 is 98945486.

It is a happy number.

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 58782889 + 9672100 = 7667^2 + 3110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68454989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68454989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68454389) 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, 75782 + ... + 76679.

It is an arithmetic number, because the mean of its divisors is an integer number (17151975).

Almost surely, 2^68454989 is an apocalyptic number.

It is an amenable number.

68454989 is a deficient number, since it is larger than the sum of its proper divisors (152911).

68454989 is a wasteful number, since it uses less digits than its factorization.

68454989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152910.

The product of its digits is 2488320, while the sum is 53.

The square root of 68454989 is about 8273.7530178269. The cubic root of 68454989 is about 409.0738344673.

The spelling of 68454989 in words is "sixty-eight million, four hundred fifty-four thousand, nine hundred eighty-nine".