28955446569 has 135 divisors (see below), whose sum is σ = 52431138837. Its totient is φ = 15878249856.

The previous prime is 28955446529. The next prime is 28955446573. The reversal of 28955446569 is 96564455982.

It is a happy number.

The square root of 28955446569 is 170163.

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

28955446569 is a `hidden beast` number, since 2 + 89 + 5 + 544 + 6 + 5 + 6 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 7222790169 + 21732656400 = 84987^2 + 147420^2 .

It is not a de Polignac number, because 28955446569 - 2²⁵ = 28921892137 is a prime.

It is a super-2 number, since 2×28955446569² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

Its product of digits (93312000) is a multiple of the sum of its prime divisors (120).

It is not an unprimeable number, because it can be changed into a prime (28955446519) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 396649917 + ... + 396649989.

Almost surely, 2^28955446569 is an apocalyptic number.

28955446569 is the 170163-rd square number.

28955446569 is the 85082-nd centered octagonal number.

It is an amenable number.

28955446569 is a deficient number, since it is larger than the sum of its proper divisors (23475692268).

28955446569 is an frugal number, since it uses more digits than its factorization.

28955446569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246 (or 120 counting only the distinct ones).

The product of its digits is 93312000, while the sum is 63.

The spelling of 28955446569 in words is "twenty-eight billion, nine hundred fifty-five million, four hundred forty-six thousand, five hundred sixty-nine".