28745237 has 4 divisors (see below), whose sum is σ = 28872096. Its totient is φ = 28618380.

The previous prime is 28745231. The next prime is 28745257. The reversal of 28745237 is 73254782.

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 a cyclic number.

It is not a de Polignac number, because 28745237 - 2⁴ = 28745221 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 28745237.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28745231) 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, 63089 + ... + 63542.

It is an arithmetic number, because the mean of its divisors is an integer number (7218024).

Almost surely, 2^28745237 is an apocalyptic number.

It is an amenable number.

28745237 is a deficient number, since it is larger than the sum of its proper divisors (126859).

28745237 is a wasteful number, since it uses less digits than its factorization.

28745237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126858.

The product of its digits is 94080, while the sum is 38.

The square root of 28745237 is about 5361.4584769445. The cubic root of 28745237 is about 306.3293654086.

It can be divided in two parts, 28745 and 237, that added together give a palindrome (28982).

The spelling of 28745237 in words is "twenty-eight million, seven hundred forty-five thousand, two hundred thirty-seven".