28371022969 has 9 divisors (see below), whose sum is σ = 28509986253. Its totient is φ = 28232736192.

The previous prime is 28371022949. The next prime is 28371022987. The reversal of 28371022969 is 96922017382.

The square root of 28371022969 is 168437.

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 12391029225 + 15979993744 = 111315^2 + 126412^2 .

It is not a de Polignac number, because 28371022969 - 2²¹ = 28368925817 is a prime.

It is a super-2 number, since 2×28371022969² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28371022909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 65521777 + ... + 65522209.

Almost surely, 2^28371022969 is an apocalyptic number.

28371022969 is the 168437-th square number.

28371022969 is the 84219-th centered octagonal number.

It is an amenable number.

28371022969 is a deficient number, since it is larger than the sum of its proper divisors (138963284).

28371022969 is an frugal number, since it uses more digits than its factorization.

28371022969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1644 (or 822 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 49.

Multiplying 28371022969 by its sum of digits (49), we get a square (1390180125481 = 1179059²).

The spelling of 28371022969 in words is "twenty-eight billion, three hundred seventy-one million, twenty-two thousand, nine hundred sixty-nine".