68145977 has 8 divisors (see below), whose sum is σ = 69919080. Its totient is φ = 66378240.

The previous prime is 68145943. The next prime is 68145991. The reversal of 68145977 is 77954186.

It can be written as a sum of positive squares in 4 ways, for example, as 30151081 + 37994896 = 5491^2 + 6164^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68145977 - 2¹⁰ = 68144953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68145907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41549 + ... + 43157.

It is an arithmetic number, because the mean of its divisors is an integer number (8739885).

Almost surely, 2^68145977 is an apocalyptic number.

It is an amenable number.

68145977 is a deficient number, since it is larger than the sum of its proper divisors (1773103).

68145977 is a wasteful number, since it uses less digits than its factorization.

68145977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2683.

The product of its digits is 423360, while the sum is 47.

The square root of 68145977 is about 8255.0576618216. The cubic root of 68145977 is about 408.4573738760.

The spelling of 68145977 in words is "sixty-eight million, one hundred forty-five thousand, nine hundred seventy-seven".