67719542778 has 48 divisors (see below), whose sum is σ = 160168401120. Its totient is φ = 21385115856.

The previous prime is 67719542777. The next prime is 67719542791. The reversal of 67719542778 is 87724591776.

67719542778 is a `hidden beast` number, since 6 + 7 + 7 + 19 + 542 + 7 + 78 = 666.

It is a super-2 number, since 2×67719542778² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (67719542773) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3657625 + ... + 3676092.

It is an arithmetic number, because the mean of its divisors is an integer number (3336841690).

Almost surely, 2^67719542778 is an apocalyptic number.

67719542778 is an abundant number, since it is smaller than the sum of its proper divisors (92448858342).

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

67719542778 is a wasteful number, since it uses less digits than its factorization.

67719542778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7333753 (or 7333741 counting only the distinct ones).

The product of its digits is 41489280, while the sum is 63.

The spelling of 67719542778 in words is "sixty-seven billion, seven hundred nineteen million, five hundred forty-two thousand, seven hundred seventy-eight".