28252137 has 4 divisors (see below), whose sum is σ = 37669520. Its totient is φ = 18834756.

The previous prime is 28252117. The next prime is 28252151. The reversal of 28252137 is 73125282.

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 not a de Polignac number, because 28252137 - 2⁷ = 28252009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28252117) 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, 4708687 + ... + 4708692.

It is an arithmetic number, because the mean of its divisors is an integer number (9417380).

Almost surely, 2^28252137 is an apocalyptic number.

It is an amenable number.

28252137 is a deficient number, since it is larger than the sum of its proper divisors (9417383).

28252137 is an equidigital number, since it uses as much as digits as its factorization.

28252137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9417382.

The product of its digits is 6720, while the sum is 30.

The square root of 28252137 is about 5315.2739346152. The cubic root of 28252137 is about 304.5676468353.

The spelling of 28252137 in words is "twenty-eight million, two hundred fifty-two thousand, one hundred thirty-seven".