8420264644 has 81 divisors (see below), whose sum is σ = 16754975181. Its totient is φ = 3699843840.

The previous prime is 8420264641. The next prime is 8420264653. The reversal of 8420264644 is 4464620248.

It is a happy number.

The square root of 8420264644 is 91762.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 3781020100 + 4639244544 = 61490^2 + 68112^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8420264597 and 8420264606.

It is not an unprimeable number, because it can be changed into a prime (8420264641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 86806804 + ... + 86806900.

Almost surely, 2^8420264644 is an apocalyptic number.

8420264644 is the 91762-nd square number.

It is an amenable number.

8420264644 is a deficient number, since it is larger than the sum of its proper divisors (8334710537).

8420264644 is a wasteful number, since it uses less digits than its factorization.

8420264644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306 (or 153 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 40.

The cubic root of 8420264644 is about 2034.4260762836.

The spelling of 8420264644 in words is "eight billion, four hundred twenty million, two hundred sixty-four thousand, six hundred forty-four".