780465138 has 16 divisors (see below), whose sum is σ = 1652749920. Its totient is φ = 244851776.

The previous prime is 780465137. The next prime is 780465143. The reversal of 780465138 is 831564087.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 780465138.

It is not an unprimeable number, because it can be changed into a prime (780465131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3825708 + ... + 3825911.

It is an arithmetic number, because the mean of its divisors is an integer number (103296870).

Almost surely, 2^780465138 is an apocalyptic number.

780465138 is an abundant number, since it is smaller than the sum of its proper divisors (872284782).

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

780465138 is a wasteful number, since it uses less digits than its factorization.

780465138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7651641.

The product of its (nonzero) digits is 161280, while the sum is 42.

The square root of 780465138 is about 27936.8061524577. The cubic root of 780465138 is about 920.6993493112.

The spelling of 780465138 in words is "seven hundred eighty million, four hundred sixty-five thousand, one hundred thirty-eight".