678998393424 has 60 divisors (see below), whose sum is σ = 2046425719156. Its totient is φ = 208922582016.

The previous prime is 678998393377. The next prime is 678998393441. The reversal of 678998393424 is 424393899876.

678998393424 is a `hidden beast` number, since 6 + 7 + 89 + 98 + 39 + 3 + 424 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 403184361024 + 275814032400 = 634968^2 + 525180^2 .

It is a super-2 number, since 2×678998393424² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 181354537 + ... + 181358280.

Almost surely, 2^678998393424 is an apocalyptic number.

It is an amenable number.

678998393424 is an abundant number, since it is smaller than the sum of its proper divisors (1367427325732).

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

678998393424 is a wasteful number, since it uses less digits than its factorization.

678998393424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362712844 (or 362712835 counting only the distinct ones).

The product of its digits is 564350976, while the sum is 72.

The spelling of 678998393424 in words is "six hundred seventy-eight billion, nine hundred ninety-eight million, three hundred ninety-three thousand, four hundred twenty-four".