28829220 has 96 divisors (see below), whose sum is σ = 93477888. Its totient is φ = 6502272.

The previous prime is 28829209. The next prime is 28829231. The reversal of 28829220 is 2292882.

It is an interprime number because it is at equal distance from previous prime (28829209) and next prime (28829231).

It is a super-2 number, since 2×28829220² = 1662247851616800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34447 + ... + 35273.

It is an arithmetic number, because the mean of its divisors is an integer number (973728).

Almost surely, 2^28829220 is an apocalyptic number.

28829220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28829220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46738944).

28829220 is an abundant number, since it is smaller than the sum of its proper divisors (64648668).

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

28829220 is a wasteful number, since it uses less digits than its factorization.

28829220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 929 (or 927 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 28829220 is about 5369.2848685835. The cubic root of 28829220 is about 306.6274025555.

The spelling of 28829220 in words is "twenty-eight million, eight hundred twenty-nine thousand, two hundred twenty".