8420086644 has 24 divisors (see below), whose sum is σ = 19667511360. Its totient is φ = 2803746624.

The previous prime is 8420086643. The next prime is 8420086699. The reversal of 8420086644 is 4466800248.

It is a junction number, because it is equal to n+sod(n) for n = 8420086596 and 8420086605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8420086643) 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, 356704 + ... + 379575.

It is an arithmetic number, because the mean of its divisors is an integer number (819479640).

Almost surely, 2^8420086644 is an apocalyptic number.

It is an amenable number.

8420086644 is an abundant number, since it is smaller than the sum of its proper divisors (11247424716).

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

8420086644 is a wasteful number, since it uses less digits than its factorization.

8420086644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737239 (or 737237 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 42.

The square root of 8420086644 is about 91761.0300944796. The cubic root of 8420086644 is about 2034.4117406141.

The spelling of 8420086644 in words is "eight billion, four hundred twenty million, eighty-six thousand, six hundred forty-four".