67004427978 has 24 divisors (see below), whose sum is σ = 146613653316. Its totient is φ = 22113672000.

The previous prime is 67004427953. The next prime is 67004428037. The reversal of 67004427978 is 87972440076.

67004427978 is a `hidden beast` number, since 67 + 0 + 0 + 442 + 79 + 78 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 66531495969 + 472932009 = 257937^2 + 21747^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18426243 + ... + 18429878.

Almost surely, 2^67004427978 is an apocalyptic number.

67004427978 is an abundant number, since it is smaller than the sum of its proper divisors (79609225338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

67004427978 is a wasteful number, since it uses less digits than its factorization.

67004427978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36856230 (or 36856227 counting only the distinct ones).

The product of its (nonzero) digits is 4741632, while the sum is 54.

The spelling of 67004427978 in words is "sixty-seven billion, four million, four hundred twenty-seven thousand, nine hundred seventy-eight".