28648313 has 4 divisors (see below), whose sum is σ = 28672500. Its totient is φ = 28624128.

The previous prime is 28648307. The next prime is 28648337. The reversal of 28648313 is 31384682.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9314704 + 19333609 = 3052^2 + 4397^2 .

It is a cyclic number.

It is not a de Polignac number, because 28648313 - 2⁴ = 28648297 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28648303) 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, 10220 + ... + 12717.

It is an arithmetic number, because the mean of its divisors is an integer number (7168125).

Almost surely, 2^28648313 is an apocalyptic number.

It is an amenable number.

28648313 is a deficient number, since it is larger than the sum of its proper divisors (24187).

28648313 is a wasteful number, since it uses less digits than its factorization.

28648313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24186.

The product of its digits is 27648, while the sum is 35.

The square root of 28648313 is about 5352.4118862434. The cubic root of 28648313 is about 305.9846810507.

The spelling of 28648313 in words is "twenty-eight million, six hundred forty-eight thousand, three hundred thirteen".