67978086772 has 6 divisors (see below), whose sum is σ = 118961651858. Its totient is φ = 33989043384.

The previous prime is 67978086763. The next prime is 67978086773. The reversal of 67978086772 is 27768087976.

It can be written as a sum of positive squares in only one way, i.e., 67295623396 + 682463376 = 259414^2 + 26124^2 .

It is a super-2 number, since 2×67978086772² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 67978086698 and 67978086707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67978086773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8497260843 + ... + 8497260850.

Almost surely, 2^67978086772 is an apocalyptic number.

It is an amenable number.

67978086772 is a deficient number, since it is larger than the sum of its proper divisors (50983565086).

67978086772 is a wasteful number, since it uses less digits than its factorization.

67978086772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16994521697 (or 16994521695 counting only the distinct ones).

The product of its (nonzero) digits is 99574272, while the sum is 67.

The spelling of 67978086772 in words is "sixty-seven billion, nine hundred seventy-eight million, eighty-six thousand, seven hundred seventy-two".