67778540 has 24 divisors (see below), whose sum is σ = 144462192. Its totient is φ = 26706240.

The previous prime is 67778533. The next prime is 67778549. The reversal of 67778540 is 4587776.

It is a junction number, because it is equal to n+sod(n) for n = 67778491 and 67778500.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23951 + ... + 26630.

It is an arithmetic number, because the mean of its divisors is an integer number (6019258).

Almost surely, 2^67778540 is an apocalyptic number.

It is an amenable number.

67778540 is an abundant number, since it is smaller than the sum of its proper divisors (76683652).

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

67778540 is a wasteful number, since it uses less digits than its factorization.

67778540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50657 (or 50655 counting only the distinct ones).

The product of its (nonzero) digits is 329280, while the sum is 44.

The square root of 67778540 is about 8232.7723155690. The cubic root of 67778540 is about 407.7219286198.

The spelling of 67778540 in words is "sixty-seven million, seven hundred seventy-eight thousand, five hundred forty".