28223525 has 24 divisors (see below), whose sum is σ = 39506400. Its totient is φ = 19812800.

The previous prime is 28223513. The next prime is 28223527. The reversal of 28223525 is 52532282.

It is a happy number.

It is not a de Polignac number, because 28223525 - 2⁴ = 28223509 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28223527) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6206 + ... + 9744.

It is an arithmetic number, because the mean of its divisors is an integer number (1646100).

Almost surely, 2^28223525 is an apocalyptic number.

28223525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28223525 is a deficient number, since it is larger than the sum of its proper divisors (11282875).

28223525 is a wasteful number, since it uses less digits than its factorization.

28223525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3589 (or 3584 counting only the distinct ones).

The product of its digits is 9600, while the sum is 29.

The square root of 28223525 is about 5312.5817640767. The cubic root of 28223525 is about 304.4647964098.

The spelling of 28223525 in words is "twenty-eight million, two hundred twenty-three thousand, five hundred twenty-five".