28507369 has 4 divisors (see below), whose sum is σ = 31098960. Its totient is φ = 25915780.

The previous prime is 28507363. The next prime is 28507393. The reversal of 28507369 is 96370582.

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 not a de Polignac number, because 28507369 - 2⁵ = 28507337 is a prime.

It is a super-2 number, since 2×28507369² = 1625340174604322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28507363) 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, 1295779 + ... + 1295800.

It is an arithmetic number, because the mean of its divisors is an integer number (7774740).

Almost surely, 2^28507369 is an apocalyptic number.

It is an amenable number.

28507369 is a deficient number, since it is larger than the sum of its proper divisors (2591591).

28507369 is a wasteful number, since it uses less digits than its factorization.

28507369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2591590.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 28507369 is about 5339.2292514931. The cubic root of 28507369 is about 305.4820613005.

The spelling of 28507369 in words is "twenty-eight million, five hundred seven thousand, three hundred sixty-nine".