67785481 has 2 divisors, whose sum is σ = 67785482. Its totient is φ = 67785480.

The previous prime is 67785479. The next prime is 67785493. The reversal of 67785481 is 18458776.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35295481 + 32490000 = 5941^2 + 5700^2 .

It is a cyclic number.

It is not a de Polignac number, because 67785481 - 2¹ = 67785479 is a prime.

It is a super-2 number, since 2×67785481² = 9189742868802722, which contains 22 as substring.

Together with 67785479, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (67785461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33892740 + 33892741.

It is an arithmetic number, because the mean of its divisors is an integer number (33892741).

Almost surely, 2^67785481 is an apocalyptic number.

It is an amenable number.

67785481 is a deficient number, since it is larger than the sum of its proper divisors (1).

67785481 is an equidigital number, since it uses as much as digits as its factorization.

67785481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 376320, while the sum is 46.

The square root of 67785481 is about 8233.1938517200. The cubic root of 67785481 is about 407.7358460107.

The spelling of 67785481 in words is "sixty-seven million, seven hundred eighty-five thousand, four hundred eighty-one".