68109457 has 4 divisors (see below), whose sum is σ = 73348660. Its totient is φ = 62870256.

The previous prime is 68109421. The next prime is 68109467. The reversal of 68109457 is 75490186.

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 36288576 + 31820881 = 6024^2 + 5641^2 .

It is a cyclic number.

It is not a de Polignac number, because 68109457 - 2¹¹ = 68107409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68109407) 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, 2619582 + ... + 2619607.

It is an arithmetic number, because the mean of its divisors is an integer number (18337165).

Almost surely, 2^68109457 is an apocalyptic number.

It is an amenable number.

68109457 is a deficient number, since it is larger than the sum of its proper divisors (5239203).

68109457 is a wasteful number, since it uses less digits than its factorization.

68109457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5239202.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 68109457 is about 8252.8453881071. The cubic root of 68109457 is about 408.3843955950.

The spelling of 68109457 in words is "sixty-eight million, one hundred nine thousand, four hundred fifty-seven".