28353869 has 4 divisors (see below), whose sum is σ = 28378944. Its totient is φ = 28328796.

The previous prime is 28353863. The next prime is 28353881. The reversal of 28353869 is 96835382.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28353869 is a prime.

It is a super-2 number, since 2×28353869² = 1607883774538322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28353863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10757 + ... + 13130.

It is an arithmetic number, because the mean of its divisors is an integer number (7094736).

Almost surely, 2^28353869 is an apocalyptic number.

It is an amenable number.

28353869 is a deficient number, since it is larger than the sum of its proper divisors (25075).

28353869 is a wasteful number, since it uses less digits than its factorization.

28353869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25074.

The product of its digits is 311040, while the sum is 44.

The square root of 28353869 is about 5324.8351148181. The cubic root of 28353869 is about 304.9327774453.

The spelling of 28353869 in words is "twenty-eight million, three hundred fifty-three thousand, eight hundred sixty-nine".