678671424 has 84 divisors (see below), whose sum is σ = 1953760380. Its totient is φ = 225239040.

The previous prime is 678671417. The next prime is 678671443. The reversal of 678671424 is 424176876.

It can be written as a sum of positive squares in 2 ways, for example, as 492840000 + 185831424 = 22200^2 + 13632^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 678671424.

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, 136372 + ... + 141260.

Almost surely, 2^678671424 is an apocalyptic number.

678671424 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678671424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (976880190).

678671424 is an abundant number, since it is smaller than the sum of its proper divisors (1275088956).

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

678671424 is a wasteful number, since it uses less digits than its factorization.

678671424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5148 (or 5135 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The square root of 678671424 is about 26051.3228838767. The cubic root of 678671424 is about 878.7928627768.

It can be divided in two parts, 6786 and 71424, that added together give a triangular number (78210 = T₃₉₅).

The spelling of 678671424 in words is "six hundred seventy-eight million, six hundred seventy-one thousand, four hundred twenty-four".