28030437 has 6 divisors (see below), whose sum is σ = 40488422. Its totient is φ = 18686952.

The previous prime is 28030427. The next prime is 28030439. The reversal of 28030437 is 73403082.

It can be written as a sum of positive squares in only one way, i.e., 20196036 + 7834401 = 4494^2 + 2799^2 .

It is not a de Polignac number, because 28030437 - 2⁴ = 28030421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28030437.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28030439) 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, 1557238 + ... + 1557255.

Almost surely, 2^28030437 is an apocalyptic number.

It is an amenable number.

28030437 is a deficient number, since it is larger than the sum of its proper divisors (12457985).

28030437 is a wasteful number, since it uses less digits than its factorization.

28030437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3114499 (or 3114496 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 28030437 is about 5294.3778671342. The cubic root of 28030437 is about 303.7688866984.

The spelling of 28030437 in words is "twenty-eight million, thirty thousand, four hundred thirty-seven".