28162513 has 8 divisors (see below), whose sum is σ = 29009960. Its totient is φ = 27319680.

The previous prime is 28162501. The next prime is 28162517. The reversal of 28162513 is 31526182.

28162513 = 3752² + 3753².

It can be written as a sum of positive squares in 4 ways, for example, as 6185169 + 21977344 = 2487^2 + 4688^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28162513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28162517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14203 + ... + 16063.

It is an arithmetic number, because the mean of its divisors is an integer number (3626245).

Almost surely, 2^28162513 is an apocalyptic number.

28162513 is the 3753-rd centered square number.

It is an amenable number.

28162513 is a deficient number, since it is larger than the sum of its proper divisors (847447).

28162513 is a wasteful number, since it uses less digits than its factorization.

28162513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2307.

The product of its digits is 2880, while the sum is 28.

The square root of 28162513 is about 5306.8364399141. The cubic root of 28162513 is about 304.2452466102.

Adding to 28162513 its reverse (31526182), we get a palindrome (59688695).

It can be divided in two parts, 2816 and 2513, that added together give a square (5329 = 73²).

The spelling of 28162513 in words is "twenty-eight million, one hundred sixty-two thousand, five hundred thirteen".