68143977 has 24 divisors (see below), whose sum is σ = 110362080. Its totient is φ = 41213160.

The previous prime is 68143961. The next prime is 68143987. The reversal of 68143977 is 77934186.

It is not a de Polignac number, because 68143977 - 2⁴ = 68143961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68143987) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 142024 + ... + 142502.

It is an arithmetic number, because the mean of its divisors is an integer number (4598420).

Almost surely, 2^68143977 is an apocalyptic number.

It is an amenable number.

68143977 is a deficient number, since it is larger than the sum of its proper divisors (42218103).

68143977 is an equidigital number, since it uses as much as digits as its factorization.

68143977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978 (or 493 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 68143977 is about 8254.9365230751. The cubic root of 68143977 is about 408.4533779310.

The spelling of 68143977 in words is "sixty-eight million, one hundred forty-three thousand, nine hundred seventy-seven".