28219716 has 72 divisors (see below), whose sum is σ = 82328064. Its totient is φ = 7983360.

The previous prime is 28219699. The next prime is 28219717. The reversal of 28219716 is 61791282.

It is a super-2 number, since 2×28219716² = 1592704742241312, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is not an unprimeable number, because it can be changed into a prime (28219717) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27981 + ... + 28971.

Almost surely, 2^28219716 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28219716, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41164032).

28219716 is an abundant number, since it is smaller than the sum of its proper divisors (54108348).

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

28219716 is a wasteful number, since it uses less digits than its factorization.

28219716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121 (or 1116 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 28219716 is about 5312.2232633804. The cubic root of 28219716 is about 304.4510991061.

The spelling of 28219716 in words is "twenty-eight million, two hundred nineteen thousand, seven hundred sixteen".