780064538 has 16 divisors (see below), whose sum is σ = 1287769536. Its totient is φ = 351435840.

The previous prime is 780064477. The next prime is 780064541. The reversal of 780064538 is 835460087.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 780064495 and 780064504.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154406 + ... + 159377.

It is an arithmetic number, because the mean of its divisors is an integer number (80485596).

Almost surely, 2^780064538 is an apocalyptic number.

780064538 is a deficient number, since it is larger than the sum of its proper divisors (507704998).

780064538 is a wasteful number, since it uses less digits than its factorization.

780064538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313909.

The product of its (nonzero) digits is 161280, while the sum is 41.

The square root of 780064538 is about 27929.6354791823. The cubic root of 780064538 is about 920.5417957087.

The spelling of 780064538 in words is "seven hundred eighty million, sixty-four thousand, five hundred thirty-eight".