28315437 has 4 divisors (see below), whose sum is σ = 37753920. Its totient is φ = 18876956.

The previous prime is 28315433. The next prime is 28315481. The reversal of 28315437 is 73451382.

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 28315437 - 2² = 28315433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28315398 and 28315407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28315433) 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, 4719237 + ... + 4719242.

It is an arithmetic number, because the mean of its divisors is an integer number (9438480).

Almost surely, 2^28315437 is an apocalyptic number.

It is an amenable number.

28315437 is a deficient number, since it is larger than the sum of its proper divisors (9438483).

28315437 is an equidigital number, since it uses as much as digits as its factorization.

28315437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9438482.

The product of its digits is 20160, while the sum is 33.

The square root of 28315437 is about 5321.2251408863. The cubic root of 28315437 is about 304.7949423421.

The spelling of 28315437 in words is "twenty-eight million, three hundred fifteen thousand, four hundred thirty-seven".