67778541 has 12 divisors (see below), whose sum is σ = 103661532. Its totient is φ = 42527616.

The previous prime is 67778533. The next prime is 67778549. The reversal of 67778541 is 14587776.

It is an interprime number because it is at equal distance from previous prime (67778533) and next prime (67778549).

It can be written as a sum of positive squares in 2 ways, for example, as 40373316 + 27405225 = 6354^2 + 5235^2 .

It is not a de Polignac number, because 67778541 - 2³ = 67778533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67778549) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 221346 + ... + 221651.

It is an arithmetic number, because the mean of its divisors is an integer number (8638461).

Almost surely, 2^67778541 is an apocalyptic number.

It is an amenable number.

67778541 is a deficient number, since it is larger than the sum of its proper divisors (35882991).

67778541 is a wasteful number, since it uses less digits than its factorization.

67778541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443020 (or 443017 counting only the distinct ones).

The product of its digits is 329280, while the sum is 45.

The square root of 67778541 is about 8232.7723763019. The cubic root of 67778541 is about 407.7219306250.

The spelling of 67778541 in words is "sixty-seven million, seven hundred seventy-eight thousand, five hundred forty-one".