28447137 has 18 divisors (see below), whose sum is σ = 43653558. Its totient is φ = 17847552.

The previous prime is 28447063. The next prime is 28447157. The reversal of 28447137 is 73174482.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 19501056 + 8946081 = 4416^2 + 2991^2 .

It is not a de Polignac number, because 28447137 - 2¹⁰ = 28446113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28447157) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2868 + ... + 8069.

Almost surely, 2^28447137 is an apocalyptic number.

It is an amenable number.

28447137 is a deficient number, since it is larger than the sum of its proper divisors (15206421).

28447137 is a wasteful number, since it uses less digits than its factorization.

28447137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10977 (or 10957 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 28447137 is about 5333.5857544433. The cubic root of 28447137 is about 305.2667629396.

The spelling of 28447137 in words is "twenty-eight million, four hundred forty-seven thousand, one hundred thirty-seven".