67780469 has 2 divisors, whose sum is σ = 67780470. Its totient is φ = 67780468.

The previous prime is 67780423. The next prime is 67780487. The reversal of 67780469 is 96408776.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46758244 + 21022225 = 6838^2 + 4585^2 .

It is a cyclic number.

It is not a de Polignac number, because 67780469 - 2⁸ = 67780213 is a prime.

It is a super-2 number, since 2×67780469² = 9188383955719922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67782469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33890234 + 33890235.

It is an arithmetic number, because the mean of its divisors is an integer number (33890235).

Almost surely, 2^67780469 is an apocalyptic number.

It is an amenable number.

67780469 is a deficient number, since it is larger than the sum of its proper divisors (1).

67780469 is an equidigital number, since it uses as much as digits as its factorization.

67780469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 67780469 is about 8232.8894684673. The cubic root of 67780469 is about 407.7257965508.

The spelling of 67780469 in words is "sixty-seven million, seven hundred eighty thousand, four hundred sixty-nine".