67990061 has 2 divisors, whose sum is σ = 67990062. Its totient is φ = 67990060.

The previous prime is 67990057. The next prime is 67990103. The reversal of 67990061 is 16009976.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66113161 + 1876900 = 8131^2 + 1370^2 .

It is a cyclic number.

It is not a de Polignac number, because 67990061 - 2² = 67990057 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 67989997 and 67990024.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67990561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33995030 + 33995031.

It is an arithmetic number, because the mean of its divisors is an integer number (33995031).

Almost surely, 2^67990061 is an apocalyptic number.

It is an amenable number.

67990061 is a deficient number, since it is larger than the sum of its proper divisors (1).

67990061 is an equidigital number, since it uses as much as digits as its factorization.

67990061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 67990061 is about 8245.6085888187. The cubic root of 67990061 is about 408.1456231590.

The spelling of 67990061 in words is "sixty-seven million, nine hundred ninety thousand, sixty-one".