78180810884638 has 128 divisors (see below), whose sum is σ = 154236288983040. Its totient is φ = 28837492629120.

The previous prime is 78180810884611. The next prime is 78180810884641. The reversal of 78180810884638 is 83648801808187.

It is a happy number.

It is a super-3 number, since 3×78180810884638³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 63832053 + ... + 65045311.

It is an arithmetic number, because the mean of its divisors is an integer number (1204971007680).

Almost surely, 2^{78180810884638} is an apocalyptic number.

78180810884638 is a deficient number, since it is larger than the sum of its proper divisors (76055478098402).

78180810884638 is a wasteful number, since it uses less digits than its factorization.

78180810884638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213622.

The product of its (nonzero) digits is 132120576, while the sum is 70.

The spelling of 78180810884638 in words is "seventy-eight trillion, one hundred eighty billion, eight hundred ten million, eight hundred eighty-four thousand, six hundred thirty-eight".