67638172340 has 48 divisors (see below), whose sum is σ = 150425335872. Its totient is φ = 25458725376.

The previous prime is 67638172331. The next prime is 67638172351. The reversal of 67638172340 is 4327183676.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1997027 + ... + 2030613.

It is an arithmetic number, because the mean of its divisors is an integer number (3133861164).

Almost surely, 2^67638172340 is an apocalyptic number.

It is an amenable number.

67638172340 is an abundant number, since it is smaller than the sum of its proper divisors (82787163532).

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

67638172340 is a wasteful number, since it uses less digits than its factorization.

67638172340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39536 (or 39534 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 47.

The spelling of 67638172340 in words is "sixty-seven billion, six hundred thirty-eight million, one hundred seventy-two thousand, three hundred forty".