68388904390 has 32 divisors (see below), whose sum is σ = 127504855296. Its totient is φ = 26382737280.

The previous prime is 68388904357. The next prime is 68388904417. The reversal of 68388904390 is 9340988386.

It is a super-2 number, since 2×68388904390² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 285637 + ... + 467296.

It is an arithmetic number, because the mean of its divisors is an integer number (3984526728).

Almost surely, 2^68388904390 is an apocalyptic number.

68388904390 is a deficient number, since it is larger than the sum of its proper divisors (59115950906).

68388904390 is a wasteful number, since it uses less digits than its factorization.

68388904390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753264.

The product of its (nonzero) digits is 8957952, while the sum is 58.

The spelling of 68388904390 in words is "sixty-eight billion, three hundred eighty-eight million, nine hundred four thousand, three hundred ninety".