28471613 has 4 divisors (see below), whose sum is σ = 29077440. Its totient is φ = 27865788.

The previous prime is 28471607. The next prime is 28471621. The reversal of 28471613 is 31617482.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28471613 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 28471613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28471603) 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, 302843 + ... + 302936.

It is an arithmetic number, because the mean of its divisors is an integer number (7269360).

Almost surely, 2^28471613 is an apocalyptic number.

It is an amenable number.

28471613 is a deficient number, since it is larger than the sum of its proper divisors (605827).

28471613 is an equidigital number, since it uses as much as digits as its factorization.

28471613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605826.

The product of its digits is 8064, while the sum is 32.

The square root of 28471613 is about 5335.8797775062. The cubic root of 28471613 is about 305.3542886476.

The spelling of 28471613 in words is "twenty-eight million, four hundred seventy-one thousand, six hundred thirteen".