28750237 has 6 divisors (see below), whose sum is σ = 29708574. Its totient is φ = 27821880.

The previous prime is 28750217. The next prime is 28750259. The reversal of 28750237 is 73205782.

It can be written as a sum of positive squares in only one way, i.e., 28100601 + 649636 = 5301^2 + 806^2 .

It is not a de Polignac number, because 28750237 - 2⁷ = 28750109 is a prime.

It is a super-2 number, since 2×28750237² = 1653152255112338, 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 (28750217) 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, 13998 + ... + 15919.

It is an arithmetic number, because the mean of its divisors is an integer number (4951429).

Almost surely, 2^28750237 is an apocalyptic number.

It is an amenable number.

28750237 is a deficient number, since it is larger than the sum of its proper divisors (958337).

28750237 is an equidigital number, since it uses as much as digits as its factorization.

28750237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29979 (or 29948 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 28750237 is about 5361.9247477002. The cubic root of 28750237 is about 306.3471255454.

The spelling of 28750237 in words is "twenty-eight million, seven hundred fifty thousand, two hundred thirty-seven".