872909569 has 24 divisors (see below), whose sum is σ = 1031240808. Its totient is φ = 736646400.

The previous prime is 872909551. The next prime is 872909603. The reversal of 872909569 is 965909278.

It can be written as a sum of positive squares in 4 ways, for example, as 267159025 + 605750544 = 16345^2 + 24612^2 .

It is not a de Polignac number, because 872909569 - 2⁹ = 872909057 is a prime.

It is a super-2 number, since 2×872909569² = 1523942231303531522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (872909509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1152739 + ... + 1153495.

It is an arithmetic number, because the mean of its divisors is an integer number (42968367).

Almost surely, 2^872909569 is an apocalyptic number.

It is an amenable number.

872909569 is a deficient number, since it is larger than the sum of its proper divisors (158331239).

872909569 is a wasteful number, since it uses less digits than its factorization.

872909569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105 (or 1098 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 55.

The square root of 872909569 is about 29545.0430529387. The cubic root of 872909569 is about 955.7032981706.

The spelling of 872909569 in words is "eight hundred seventy-two million, nine hundred nine thousand, five hundred sixty-nine".