780346638 has 24 divisors (see below), whose sum is σ = 1691532648. Its totient is φ = 259995312.

The previous prime is 780346627. The next prime is 780346717. The reversal of 780346638 is 836643087.

780346638 is a `hidden beast` number, since 7 + 8 + 0 + 3 + 4 + 6 + 638 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 780346593 and 780346602.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 35620 + ... + 53192.

It is an arithmetic number, because the mean of its divisors is an integer number (70480527).

Almost surely, 2^780346638 is an apocalyptic number.

780346638 is an abundant number, since it is smaller than the sum of its proper divisors (911186010).

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

780346638 is a wasteful number, since it uses less digits than its factorization.

780346638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20048 (or 20045 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The square root of 780346638 is about 27934.6852139057. The cubic root of 780346638 is about 920.6527495808.

The spelling of 780346638 in words is "seven hundred eighty million, three hundred forty-six thousand, six hundred thirty-eight".