28492220 has 48 divisors (see below), whose sum is σ = 62116320. Its totient is φ = 10969344.

The previous prime is 28492213. The next prime is 28492249. The reversal of 28492220 is 2229482.

28492220 = T₁ + T₂ + ... + T₅₅₄.

28492220 is a nontrivial binomial coefficient, being equal to C(556, 3).

It is a congruent number.

It is an unprimeable number.

It is the 554-th tetrahedral number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102722 + ... + 102998.

It is an arithmetic number, because the mean of its divisors is an integer number (1294090).

Almost surely, 2^28492220 is an apocalyptic number.

28492220 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 28492220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31058160).

28492220 is an abundant number, since it is smaller than the sum of its proper divisors (33624100).

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

28492220 is a wasteful number, since it uses less digits than its factorization.

28492220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462 (or 460 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 28492220 is about 5337.8104125194. The cubic root of 28492220 is about 305.4279399991.

The spelling of 28492220 in words is "twenty-eight million, four hundred ninety-two thousand, two hundred twenty".