67778138 has 16 divisors (see below), whose sum is σ = 104945760. Its totient is φ = 32813616.

The previous prime is 67778101. The next prime is 67778153. The reversal of 67778138 is 83187776.

It is a junction number, because it is equal to n+sod(n) for n = 67778092 and 67778101.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3620 + ... + 12192.

It is an arithmetic number, because the mean of its divisors is an integer number (6559110).

Almost surely, 2^67778138 is an apocalyptic number.

67778138 is a deficient number, since it is larger than the sum of its proper divisors (37167622).

67778138 is a wasteful number, since it uses less digits than its factorization.

67778138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8701.

The product of its digits is 395136, while the sum is 47.

The square root of 67778138 is about 8232.7479009138. The cubic root of 67778138 is about 407.7211225410.

The spelling of 67778138 in words is "sixty-seven million, seven hundred seventy-eight thousand, one hundred thirty-eight".