28571513 has 4 divisors (see below), whose sum is σ = 28641780. Its totient is φ = 28501248.

The previous prime is 28571507. The next prime is 28571519. The reversal of 28571513 is 31517582.

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

It is an interprime number because it is at equal distance from previous prime (28571507) and next prime (28571519).

It can be written as a sum of positive squares in 2 ways, for example, as 19035769 + 9535744 = 4363^2 + 3088^2 .

It is a cyclic number.

It is not a de Polignac number, because 28571513 - 2⁶ = 28571449 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 28571513.

It is not an unprimeable number, because it can be changed into a prime (28571519) 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, 34520 + ... + 35337.

It is an arithmetic number, because the mean of its divisors is an integer number (7160445).

Almost surely, 2^28571513 is an apocalyptic number.

It is an amenable number.

28571513 is a deficient number, since it is larger than the sum of its proper divisors (70267).

28571513 is an equidigital number, since it uses as much as digits as its factorization.

28571513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70266.

The product of its digits is 8400, while the sum is 32.

The square root of 28571513 is about 5345.2327358124. The cubic root of 28571513 is about 305.7110098576.

The spelling of 28571513 in words is "twenty-eight million, five hundred seventy-one thousand, five hundred thirteen".