28200429 has 6 divisors (see below), whose sum is σ = 40733966. Its totient is φ = 18800280.

The previous prime is 28200409. The next prime is 28200439. The reversal of 28200429 is 92400282.

It can be written as a sum of positive squares in only one way, i.e., 24502500 + 3697929 = 4950^2 + 1923^2 .

It is not a de Polignac number, because 28200429 - 2¹¹ = 28198381 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28200409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1566682 + ... + 1566699.

Almost surely, 2^28200429 is an apocalyptic number.

It is an amenable number.

28200429 is a deficient number, since it is larger than the sum of its proper divisors (12533537).

28200429 is a wasteful number, since it uses less digits than its factorization.

28200429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3133387 (or 3133384 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 28200429 is about 5310.4076114739. The cubic root of 28200429 is about 304.3817234185.

The spelling of 28200429 in words is "twenty-eight million, two hundred thousand, four hundred twenty-nine".