28519221 has 8 divisors (see below), whose sum is σ = 38060064. Its totient is φ = 18995600.

The previous prime is 28519213. The next prime is 28519229. The reversal of 28519221 is 12291582.

It is an interprime number because it is at equal distance from previous prime (28519213) and next prime (28519229).

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 28519221 - 2³ = 28519213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28519229) 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, 250 + ... + 7556.

It is an arithmetic number, because the mean of its divisors is an integer number (4757508).

Almost surely, 2^28519221 is an apocalyptic number.

It is an amenable number.

28519221 is a deficient number, since it is larger than the sum of its proper divisors (9540843).

28519221 is a wasteful number, since it uses less digits than its factorization.

28519221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8611.

The product of its digits is 2880, while the sum is 30.

The square root of 28519221 is about 5340.3390341813. The cubic root of 28519221 is about 305.5243903764.

The spelling of 28519221 in words is "twenty-eight million, five hundred nineteen thousand, two hundred twenty-one".