67828009 has 2 divisors, whose sum is σ = 67828010. Its totient is φ = 67828008.

The previous prime is 67827979. The next prime is 67828021. The reversal of 67828009 is 90082876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48441600 + 19386409 = 6960^2 + 4403^2 .

It is a cyclic number.

It is not a de Polignac number, because 67828009 - 2⁹ = 67827497 is a prime.

It is not a weakly prime, because it can be changed into another prime (67828099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33914004 + 33914005.

It is an arithmetic number, because the mean of its divisors is an integer number (33914005).

Almost surely, 2^67828009 is an apocalyptic number.

It is an amenable number.

67828009 is a deficient number, since it is larger than the sum of its proper divisors (1).

67828009 is an equidigital number, since it uses as much as digits as its factorization.

67828009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 67828009 is about 8235.7761625727. The cubic root of 67828009 is about 407.8210981164.

The spelling of 67828009 in words is "sixty-seven million, eight hundred twenty-eight thousand, nine".