68393940432987 has 32 divisors (see below), whose sum is σ = 98380663008768. Its totient is φ = 42014073378816.

The previous prime is 68393940432977. The next prime is 68393940433043. The reversal of 68393940432987 is 78923404939386.

It is not a de Polignac number, because 68393940432987 - 2⁴ = 68393940432971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68393940432977) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56912443 + ... + 58101755.

It is an arithmetic number, because the mean of its divisors is an integer number (3074395719024).

Almost surely, 2^{68393940432987} is an apocalyptic number.

68393940432987 is a deficient number, since it is larger than the sum of its proper divisors (29986722575781).

68393940432987 is a wasteful number, since it uses less digits than its factorization.

68393940432987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1191939.

The product of its (nonzero) digits is 1693052928, while the sum is 75.

The spelling of 68393940432987 in words is "sixty-eight trillion, three hundred ninety-three billion, nine hundred forty million, four hundred thirty-two thousand, nine hundred eighty-seven".