68012557 has 4 divisors (see below), whose sum is σ = 68445916. Its totient is φ = 67579200.

The previous prime is 68012551. The next prime is 68012573. The reversal of 68012557 is 75521086.

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 15217801 + 52794756 = 3901^2 + 7266^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68012557 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 (68012551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216444 + ... + 216757.

It is an arithmetic number, because the mean of its divisors is an integer number (17111479).

Almost surely, 2^68012557 is an apocalyptic number.

It is an amenable number.

68012557 is a deficient number, since it is larger than the sum of its proper divisors (433359).

68012557 is a wasteful number, since it uses less digits than its factorization.

68012557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433358.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 68012557 is about 8246.9725960500. The cubic root of 68012557 is about 408.1906328332.

The spelling of 68012557 in words is "sixty-eight million, twelve thousand, five hundred fifty-seven".