67780331 has 2 divisors, whose sum is σ = 67780332. Its totient is φ = 67780330.

The previous prime is 67780313. The next prime is 67780351. The reversal of 67780331 is 13308776.

Together with previous prime (67780313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 67780331 - 2¹⁴ = 67763947 is a prime.

It is a super-2 number, since 2×67780331² = 9188346540939122, which contains 22 as substring.

It is equal to p_3995117 and since 67780331 and 3995117 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 67780291 and 67780300.

It is not a weakly prime, because it can be changed into another prime (67780301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33890165 + 33890166.

It is an arithmetic number, because the mean of its divisors is an integer number (33890166).

Almost surely, 2^67780331 is an apocalyptic number.

67780331 is a deficient number, since it is larger than the sum of its proper divisors (1).

67780331 is an equidigital number, since it uses as much as digits as its factorization.

67780331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 67780331 is about 8232.8810874444. The cubic root of 67780331 is about 407.7255198427.

The spelling of 67780331 in words is "sixty-seven million, seven hundred eighty thousand, three hundred thirty-one".