68457149 has 4 divisors (see below), whose sum is σ = 68546940. Its totient is φ = 68367360.

The previous prime is 68457143. The next prime is 68457157. The reversal of 68457149 is 94175486.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94175486 = 2 ⋅47087743.

It can be written as a sum of positive squares in 2 ways, for example, as 37576900 + 30880249 = 6130^2 + 5557^2 .

It is a cyclic number.

It is not a de Polignac number, because 68457149 - 2¹⁶ = 68391613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68457143) 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, 43742 + ... + 45279.

It is an arithmetic number, because the mean of its divisors is an integer number (17136735).

Almost surely, 2^68457149 is an apocalyptic number.

It is an amenable number.

68457149 is a deficient number, since it is larger than the sum of its proper divisors (89791).

68457149 is an equidigital number, since it uses as much as digits as its factorization.

68457149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89790.

The product of its digits is 241920, while the sum is 44.

The square root of 68457149 is about 8273.8835500628. The cubic root of 68457149 is about 409.0781370034.

The spelling of 68457149 in words is "sixty-eight million, four hundred fifty-seven thousand, one hundred forty-nine".