780678450 has 36 divisors (see below), whose sum is σ = 2097423978. Its totient is φ = 208180800.

The previous prime is 780678433. The next prime is 780678473. The reversal of 780678450 is 54876087.

It can be written as a sum of positive squares in 3 ways, for example, as 702833121 + 77845329 = 26511^2 + 8823^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 780678396 and 780678405.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 866971 + ... + 867870.

Almost surely, 2^780678450 is an apocalyptic number.

780678450 is an abundant number, since it is smaller than the sum of its proper divisors (1316745528).

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

780678450 is a wasteful number, since it uses less digits than its factorization.

780678450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1734859 (or 1734851 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 45.

The square root of 780678450 is about 27940.6236508779. The cubic root of 780678450 is about 920.7832216587.

The spelling of 780678450 in words is "seven hundred eighty million, six hundred seventy-eight thousand, four hundred fifty".