28541569 has 12 divisors (see below), whose sum is σ = 33316500. Its totient is φ = 24379488.

The previous prime is 28541563. The next prime is 28541573. The reversal of 28541569 is 96514582.

It can be written as a sum of positive squares in 2 ways, for example, as 18173169 + 10368400 = 4263^2 + 3220^2 .

It is not a de Polignac number, because 28541569 - 2³ = 28541561 is a prime.

It is a super-2 number, since 2×28541569² = 1629242321963522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28541561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16267 + ... + 17935.

It is an arithmetic number, because the mean of its divisors is an integer number (2776375).

Almost surely, 2^28541569 is an apocalyptic number.

It is an amenable number.

28541569 is a deficient number, since it is larger than the sum of its proper divisors (4774931).

28541569 is a wasteful number, since it uses less digits than its factorization.

28541569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2032 (or 2025 counting only the distinct ones).

The product of its digits is 86400, while the sum is 40.

The square root of 28541569 is about 5342.4310009583. The cubic root of 28541569 is about 305.6041737195.

The spelling of 28541569 in words is "twenty-eight million, five hundred forty-one thousand, five hundred sixty-nine".