8389644025 has 27 divisors (see below), whose sum is σ = 12106259469. Its totient is φ = 5750700480.

The previous prime is 8389644023. The next prime is 8389644061. The reversal of 8389644025 is 5204469838.

The square root of 8389644025 is 91595.

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

It can be written as a sum of positive squares in 4 ways, for example, as 1837065321 + 6552578704 = 42861^2 + 80948^2 .

It is not a de Polignac number, because 8389644025 - 2¹ = 8389644023 is a prime.

It is a super-2 number, since 2×8389644025² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8389644025.

It is not an unprimeable number, because it can be changed into a prime (8389644023) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3204517 + ... + 3207133.

Almost surely, 2^8389644025 is an apocalyptic number.

8389644025 is the 91595-th square number.

8389644025 is the 45798-th centered octagonal number.

It is an amenable number.

8389644025 is a deficient number, since it is larger than the sum of its proper divisors (3716615444).

8389644025 is an frugal number, since it uses more digits than its factorization.

8389644025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5258 (or 2629 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 49.

The cubic root of 8389644025 is about 2031.9569911052.

Multiplying 8389644025 by its sum of digits (49), we get a square (411092557225 = 641165²).

8389644025 divided by its sum of digits (49) gives a square (171217225 = 13085²).

The spelling of 8389644025 in words is "eight billion, three hundred eighty-nine million, six hundred forty-four thousand, twenty-five".