28220167 has 4 divisors (see below), whose sum is σ = 28247080. Its totient is φ = 28193256.

The previous prime is 28220147. The next prime is 28220191. The reversal of 28220167 is 76102282.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28220167 - 2⁷ = 28220039 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 (28220147) 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, 11817 + ... + 14002.

It is an arithmetic number, because the mean of its divisors is an integer number (7061770).

Almost surely, 2^28220167 is an apocalyptic number.

28220167 is a deficient number, since it is larger than the sum of its proper divisors (26913).

28220167 is a wasteful number, since it uses less digits than its factorization.

28220167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26912.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 28220167 is about 5312.2657124809. The cubic root of 28220167 is about 304.4527209829.

It can be divided in two parts, 282 and 20167, that added together give a square (20449 = 143²).

The spelling of 28220167 in words is "twenty-eight million, two hundred twenty thousand, one hundred sixty-seven".