678501450 has 216 divisors, whose sum is σ = 2124449964. Its totient is φ = 154598400.

The previous prime is 678501431. The next prime is 678501503. The reversal of 678501450 is 54105876.

It can be written as a sum of positive squares in 6 ways, for example, as 544335561 + 134165889 = 23331^2 + 11583^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 925284 + ... + 926016.

Almost surely, 2^678501450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678501450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1062224982).

678501450 is an abundant number, since it is smaller than the sum of its proper divisors (1445948514).

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

678501450 is a wasteful number, since it uses less digits than its factorization.

678501450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790 (or 771 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 678501450 is about 26048.0603884435. The cubic root of 678501450 is about 878.7194917735.

The spelling of 678501450 in words is "six hundred seventy-eight million, five hundred one thousand, four hundred fifty".