84780847821 has 16 divisors (see below), whose sum is σ = 114607458560. Its totient is φ = 55737642240.

The previous prime is 84780847813. The next prime is 84780847841. The reversal of 84780847821 is 12874808748.

It is a happy number.

It is not a de Polignac number, because 84780847821 - 2³ = 84780847813 is a prime.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84780847841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1576860 + ... + 1629738.

It is an arithmetic number, because the mean of its divisors is an integer number (7162966160).

Almost surely, 2^84780847821 is an apocalyptic number.

It is an amenable number.

84780847821 is a deficient number, since it is larger than the sum of its proper divisors (29826610739).

84780847821 is a wasteful number, since it uses less digits than its factorization.

84780847821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60276.

The product of its (nonzero) digits is 6422528, while the sum is 57.

The spelling of 84780847821 in words is "eighty-four billion, seven hundred eighty million, eight hundred forty-seven thousand, eight hundred twenty-one".