78084785821 has 8 divisors (see below), whose sum is σ = 89242302080. Its totient is φ = 66927906288.

The previous prime is 78084785819. The next prime is 78084785827. The reversal of 78084785821 is 12858748087.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78084785821 - 2¹ = 78084785819 is a prime.

It is a super-2 number, since 2×78084785821² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78084785827) by changing a digit.

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, 141475 + ... + 419743.

It is an arithmetic number, because the mean of its divisors is an integer number (11155287760).

Almost surely, 2^78084785821 is an apocalyptic number.

It is an amenable number.

78084785821 is a deficient number, since it is larger than the sum of its proper divisors (11157516259).

78084785821 is a wasteful number, since it uses less digits than its factorization.

78084785821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318363.

The product of its (nonzero) digits is 8028160, while the sum is 58.

It can be divided in two parts, 780847 and 85821, that added together give a palindrome (866668).

The spelling of 78084785821 in words is "seventy-eight billion, eighty-four million, seven hundred eighty-five thousand, eight hundred twenty-one".