28148517 has 6 divisors (see below), whose sum is σ = 40658982. Its totient is φ = 18765672.

The previous prime is 28148513. The next prime is 28148521. The reversal of 28148517 is 71584182.

It is an interprime number because it is at equal distance from previous prime (28148513) and next prime (28148521).

It can be written as a sum of positive squares in only one way, i.e., 14243076 + 13905441 = 3774^2 + 3729^2 .

It is not a de Polignac number, because 28148517 - 2² = 28148513 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28148513) 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, 1563798 + ... + 1563815.

It is an arithmetic number, because the mean of its divisors is an integer number (6776497).

Almost surely, 2^28148517 is an apocalyptic number.

It is an amenable number.

28148517 is a deficient number, since it is larger than the sum of its proper divisors (12510465).

28148517 is a wasteful number, since it uses less digits than its factorization.

28148517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3127619 (or 3127616 counting only the distinct ones).

The product of its digits is 17920, while the sum is 36.

The square root of 28148517 is about 5305.5175996315. The cubic root of 28148517 is about 304.1948377319.

The spelling of 28148517 in words is "twenty-eight million, one hundred forty-eight thousand, five hundred seventeen".