678987654321234 has 32 divisors (see below), whose sum is σ = 1404423696568320. Its totient is φ = 218709731899152.

The previous prime is 678987654321139. The next prime is 678987654321253. The reversal of 678987654321234 is 432123456789876.

678987654321234 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a super-2 number, since 2×678987654321234² (a number of 30 digits) contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is an upside-down number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15238950124 + ... + 15238994679.

It is an arithmetic number, because the mean of its divisors is an integer number (43888240517760).

Almost surely, 2^{678987654321234} is an apocalyptic number.

678987654321234 is an abundant number, since it is smaller than the sum of its proper divisors (725436042247086).

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

678987654321234 is a wasteful number, since it uses less digits than its factorization.

678987654321234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30477944934.

The product of its digits is 2926264320, while the sum is 75.

The spelling of 678987654321234 in words is "six hundred seventy-eight trillion, nine hundred eighty-seven billion, six hundred fifty-four million, three hundred twenty-one thousand, two hundred thirty-four".