28219550 has 12 divisors (see below), whose sum is σ = 52488456. Its totient is φ = 11287800.

The previous prime is 28219519. The next prime is 28219559. The reversal of 28219550 is 5591282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28219559) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 282146 + ... + 282245.

It is an arithmetic number, because the mean of its divisors is an integer number (4374038).

Almost surely, 2^28219550 is an apocalyptic number.

28219550 is a deficient number, since it is larger than the sum of its proper divisors (24268906).

28219550 is a wasteful number, since it uses less digits than its factorization.

28219550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564403 (or 564398 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 28219550 is about 5312.2076390141. The cubic root of 28219550 is about 304.4505021359.

The spelling of 28219550 in words is "twenty-eight million, two hundred nineteen thousand, five hundred fifty".