28487213 has 8 divisors (see below), whose sum is σ = 30052320. Its totient is φ = 26928720.

The previous prime is 28487197. The next prime is 28487219. The reversal of 28487213 is 31278482.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28487213 - 2⁴ = 28487197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28487219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9023 + ... + 11763.

It is an arithmetic number, because the mean of its divisors is an integer number (3756540).

Almost surely, 2^28487213 is an apocalyptic number.

It is an amenable number.

28487213 is a deficient number, since it is larger than the sum of its proper divisors (1565107).

28487213 is a wasteful number, since it uses less digits than its factorization.

28487213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3307.

The product of its digits is 21504, while the sum is 35.

The square root of 28487213 is about 5337.3413793761. The cubic root of 28487213 is about 305.4100477782.

The spelling of 28487213 in words is "twenty-eight million, four hundred eighty-seven thousand, two hundred thirteen".