28219356 has 36 divisors (see below), whose sum is σ = 77818104. Its totient is φ = 8551200.

The previous prime is 28219343. The next prime is 28219361. The reversal of 28219356 is 65391282.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 28219356.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35235 + ... + 36026.

It is an arithmetic number, because the mean of its divisors is an integer number (2161614).

Almost surely, 2^28219356 is an apocalyptic number.

It is an amenable number.

28219356 is an abundant number, since it is smaller than the sum of its proper divisors (49598748).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28219356 is a wasteful number, since it uses less digits than its factorization.

28219356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71282 (or 71277 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 28219356 is about 5312.1893791543. The cubic root of 28219356 is about 304.4498044691.

The spelling of 28219356 in words is "twenty-eight million, two hundred nineteen thousand, three hundred fifty-six".