68157489 has 4 divisors (see below), whose sum is σ = 90876656. Its totient is φ = 45438324.

The previous prime is 68157461. The next prime is 68157491. The reversal of 68157489 is 98475186.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 68157489 - 2²⁰ = 67108913 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68157409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11359579 + ... + 11359584.

It is an arithmetic number, because the mean of its divisors is an integer number (22719164).

Almost surely, 2^68157489 is an apocalyptic number.

It is an amenable number.

68157489 is a deficient number, since it is larger than the sum of its proper divisors (22719167).

68157489 is a wasteful number, since it uses less digits than its factorization.

68157489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22719166.

The product of its digits is 483840, while the sum is 48.

The square root of 68157489 is about 8255.7549018851. The cubic root of 68157489 is about 408.4803730157.

The spelling of 68157489 in words is "sixty-eight million, one hundred fifty-seven thousand, four hundred eighty-nine".