68638416040 has 32 divisors (see below), whose sum is σ = 154467288360. Its totient is φ = 27449881600.

The previous prime is 68638416037. The next prime is 68638416053. The reversal of 68638416040 is 4061483686.

It can be written as a sum of positive squares in 4 ways, for example, as 52266189924 + 16372226116 = 228618^2 + 127954^2 .

It is a super-2 number, since 2×68638416040² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34380 + ... + 372100.

Almost surely, 2^68638416040 is an apocalyptic number.

It is an amenable number.

68638416040 is an abundant number, since it is smaller than the sum of its proper divisors (85828872320).

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

68638416040 is a wasteful number, since it uses less digits than its factorization.

68638416040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342813 (or 342809 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 46.

The spelling of 68638416040 in words is "sixty-eight billion, six hundred thirty-eight million, four hundred sixteen thousand, forty".