67648943634 has 64 divisors (see below), whose sum is σ = 138917839104. Its totient is φ = 21955885056.

The previous prime is 67648943629. The next prime is 67648943653. The reversal of 67648943634 is 43634984676.

It is a happy number.

It is a super-2 number, since 2×67648943634² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13014324 + ... + 13019520.

It is an arithmetic number, because the mean of its divisors is an integer number (2170591236).

Almost surely, 2^67648943634 is an apocalyptic number.

67648943634 is an abundant number, since it is smaller than the sum of its proper divisors (71268895470).

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

67648943634 is a wasteful number, since it uses less digits than its factorization.

67648943634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5651.

The product of its digits is 62705664, while the sum is 60.

The spelling of 67648943634 in words is "sixty-seven billion, six hundred forty-eight million, nine hundred forty-three thousand, six hundred thirty-four".