67639911008 has 72 divisors (see below), whose sum is σ = 141631510608. Its totient is φ = 31738184192.

The previous prime is 67639910993. The next prime is 67639911019. The reversal of 67639911008 is 80011993676.

It is a super-2 number, since 2×67639911008² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2051066 + ... + 2083782.

It is an arithmetic number, because the mean of its divisors is an integer number (1967104314).

Almost surely, 2^67639911008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 67639911008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70815755304).

67639911008 is an abundant number, since it is smaller than the sum of its proper divisors (73991599600).

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

67639911008 is a wasteful number, since it uses less digits than its factorization.

67639911008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32856 (or 32795 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 50.

The spelling of 67639911008 in words is "sixty-seven billion, six hundred thirty-nine million, nine hundred eleven thousand, eight".