8420328672473 has 4 divisors (see below), whose sum is σ = 8442903280548. Its totient is φ = 8397754064400.

The previous prime is 8420328672461. The next prime is 8420328672523. The reversal of 8420328672473 is 3742768230248.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4975562976409 + 3444765696064 = 2230597^2 + 1856008^2 .

It is a cyclic number.

It is not a de Polignac number, because 8420328672473 - 2¹⁰ = 8420328671449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8420328672373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11287303478 + ... + 11287304223.

It is an arithmetic number, because the mean of its divisors is an integer number (2110725820137).

Almost surely, 2^{8420328672473} is an apocalyptic number.

It is an amenable number.

8420328672473 is a deficient number, since it is larger than the sum of its proper divisors (22574608075).

8420328672473 is a wasteful number, since it uses less digits than its factorization.

8420328672473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22574608074.

The product of its (nonzero) digits is 21676032, while the sum is 56.

The spelling of 8420328672473 in words is "eight trillion, four hundred twenty billion, three hundred twenty-eight million, six hundred seventy-two thousand, four hundred seventy-three".