68890390815 has 32 divisors (see below), whose sum is σ = 111523080960. Its totient is φ = 36309168896.

The previous prime is 68890390799. The next prime is 68890390823. The reversal of 68890390815 is 51809309886.

It is a cyclic number.

It is not a de Polignac number, because 68890390815 - 2⁴ = 68890390799 is a prime.

It is a congruent 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, 2661124 + ... + 2686886.

It is an arithmetic number, because the mean of its divisors is an integer number (3485096280).

Almost surely, 2^68890390815 is an apocalyptic number.

68890390815 is a deficient number, since it is larger than the sum of its proper divisors (42632690145).

68890390815 is a wasteful number, since it uses less digits than its factorization.

68890390815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27863.

The product of its (nonzero) digits is 3732480, while the sum is 57.

The spelling of 68890390815 in words is "sixty-eight billion, eight hundred ninety million, three hundred ninety thousand, eight hundred fifteen".