78820261252838 has 48 divisors (see below), whose sum is σ = 138822668041680. Its totient is φ = 33463446460416.

The previous prime is 78820261252729. The next prime is 78820261252861. The reversal of 78820261252838 is 83825216202887.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 455603618 + ... + 455776586.

It is an arithmetic number, because the mean of its divisors is an integer number (2892138917535).

Almost surely, 2^{78820261252838} is an apocalyptic number.

78820261252838 is a deficient number, since it is larger than the sum of its proper divisors (60002406788842).

78820261252838 is a wasteful number, since it uses less digits than its factorization.

78820261252838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216549 (or 216542 counting only the distinct ones).

The product of its (nonzero) digits is 41287680, while the sum is 62.

The spelling of 78820261252838 in words is "seventy-eight trillion, eight hundred twenty billion, two hundred sixty-one million, two hundred fifty-two thousand, eight hundred thirty-eight".