28655213 has 4 divisors (see below), whose sum is σ = 28673568. Its totient is φ = 28636860.

The previous prime is 28655203. The next prime is 28655227. The reversal of 28655213 is 31255682.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31255682 = 2 ⋅15627841.

It is a cyclic number.

It is not a de Polignac number, because 28655213 - 2⁸ = 28654957 is a prime.

It is a super-2 number, since 2×28655213² = 1642242464150738, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28655213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28655203) 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, 6593 + ... + 10038.

It is an arithmetic number, because the mean of its divisors is an integer number (7168392).

Almost surely, 2^28655213 is an apocalyptic number.

It is an amenable number.

28655213 is a deficient number, since it is larger than the sum of its proper divisors (18355).

28655213 is a wasteful number, since it uses less digits than its factorization.

28655213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18354.

The product of its digits is 14400, while the sum is 32.

The square root of 28655213 is about 5353.0564166652. The cubic root of 28655213 is about 306.0092447404.

The spelling of 28655213 in words is "twenty-eight million, six hundred fifty-five thousand, two hundred thirteen".