67878061 has 2 divisors, whose sum is σ = 67878062. Its totient is φ = 67878060.

The previous prime is 67878047. The next prime is 67878137. The reversal of 67878061 is 16087876.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67732900 + 145161 = 8230^2 + 381^2 .

It is a cyclic number.

It is not a de Polignac number, because 67878061 - 2²¹ = 65780909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 67877999 and 67878017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67878361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33939030 + 33939031.

It is an arithmetic number, because the mean of its divisors is an integer number (33939031).

Almost surely, 2^67878061 is an apocalyptic number.

It is an amenable number.

67878061 is a deficient number, since it is larger than the sum of its proper divisors (1).

67878061 is an equidigital number, since it uses as much as digits as its factorization.

67878061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 67878061 is about 8238.8142957588. The cubic root of 67878061 is about 407.9213872794.

The spelling of 67878061 in words is "sixty-seven million, eight hundred seventy-eight thousand, sixty-one".