78506884734820 has 24 divisors (see below), whose sum is σ = 164919949302528. Its totient is φ = 31392184111200.

The previous prime is 78506884734697. The next prime is 78506884734821. The reversal of 78506884734820 is 2843748860587.

It is a self number, because there is not a number n which added to its sum of digits gives 78506884734820.

It is not an unprimeable number, because it can be changed into a prime (78506884734821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 660550516 + ... + 660669355.

It is an arithmetic number, because the mean of its divisors is an integer number (6871664554272).

Almost surely, 2^{78506884734820} is an apocalyptic number.

It is an amenable number.

78506884734820 is an abundant number, since it is smaller than the sum of its proper divisors (86413064567708).

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

78506884734820 is a wasteful number, since it uses less digits than its factorization.

78506884734820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1321222851 (or 1321222849 counting only the distinct ones).

The product of its (nonzero) digits is 578027520, while the sum is 70.

The spelling of 78506884734820 in words is "seventy-eight trillion, five hundred six billion, eight hundred eighty-four million, seven hundred thirty-four thousand, eight hundred twenty".