28575137 has 6 divisors (see below), whose sum is σ = 29369718. Its totient is φ = 27801504.

The previous prime is 28575119. The next prime is 28575143. The reversal of 28575137 is 73157582.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 13512976 + 15062161 = 3676^2 + 3881^2 .

It is not a de Polignac number, because 28575137 - 2⁸ = 28574881 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 28575137.

It is not an unprimeable number, because it can be changed into a prime (28575167) 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, 9068 + ... + 11805.

It is an arithmetic number, because the mean of its divisors is an integer number (4894953).

Almost surely, 2^28575137 is an apocalyptic number.

It is an amenable number.

28575137 is a deficient number, since it is larger than the sum of its proper divisors (794581).

28575137 is an equidigital number, since it uses as much as digits as its factorization.

28575137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20947 (or 20910 counting only the distinct ones).

The product of its digits is 58800, while the sum is 38.

The square root of 28575137 is about 5345.5717187220. The cubic root of 28575137 is about 305.7239347345.

The spelling of 28575137 in words is "twenty-eight million, five hundred seventy-five thousand, one hundred thirty-seven".