67990779648 has 144 divisors (see below), whose sum is σ = 219339187200. Its totient is φ = 20603243520.

The previous prime is 67990779599. The next prime is 67990779679. The reversal of 67990779648 is 84697709976.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×67990779648² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 371088 + ... + 523151.

It is an arithmetic number, because the mean of its divisors is an integer number (1523188800).

Almost surely, 2^67990779648 is an apocalyptic number.

It is an amenable number.

67990779648 is an abundant number, since it is smaller than the sum of its proper divisors (151348407552).

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

67990779648 is a wasteful number, since it uses less digits than its factorization.

67990779648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 894275 (or 894255 counting only the distinct ones).

The product of its (nonzero) digits is 288054144, while the sum is 72.

The spelling of 67990779648 in words is "sixty-seven billion, nine hundred ninety million, seven hundred seventy-nine thousand, six hundred forty-eight".