68651489 has 4 divisors (see below), whose sum is σ = 68686740. Its totient is φ = 68616240.

The previous prime is 68651477. The next prime is 68651509. The reversal of 68651489 is 98415686.

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 19651489 + 49000000 = 4433^2 + 7000^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68651489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68651449) 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, 14522 + ... + 18659.

It is an arithmetic number, because the mean of its divisors is an integer number (17171685).

Almost surely, 2^68651489 is an apocalyptic number.

It is an amenable number.

68651489 is a deficient number, since it is larger than the sum of its proper divisors (35251).

68651489 is a wasteful number, since it uses less digits than its factorization.

68651489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35250.

The product of its digits is 414720, while the sum is 47.

The square root of 68651489 is about 8285.6194095553. The cubic root of 68651489 is about 409.4648759333.

The spelling of 68651489 in words is "sixty-eight million, six hundred fifty-one thousand, four hundred eighty-nine".