67478661872 has 20 divisors (see below), whose sum is σ = 136424251920. Its totient is φ = 32272403328.

The previous prime is 67478661857. The next prime is 67478661881. The reversal of 67478661872 is 27816687476.

It is a happy number.

It is a super-3 number, since 3×67478661872³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91682597 + ... + 91683332.

It is an arithmetic number, because the mean of its divisors is an integer number (6821212596).

Almost surely, 2^67478661872 is an apocalyptic number.

It is an amenable number.

67478661872 is an abundant number, since it is smaller than the sum of its proper divisors (68945590048).

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

67478661872 is a wasteful number, since it uses less digits than its factorization.

67478661872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183365960 (or 183365954 counting only the distinct ones).

The product of its digits is 37933056, while the sum is 62.

The spelling of 67478661872 in words is "sixty-seven billion, four hundred seventy-eight million, six hundred sixty-one thousand, eight hundred seventy-two".