28484820 has 288 divisors, whose sum is σ = 111541248. Its totient is φ = 5723136.

The previous prime is 28484803. The next prime is 28484831. The reversal of 28484820 is 2848482.

It is a super-2 number, since 2×28484820² = 1622769940864800, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 606037 + ... + 606083.

It is an arithmetic number, because the mean of its divisors is an integer number (387296).

Almost surely, 2^28484820 is an apocalyptic number.

28484820 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 28484820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55770624).

28484820 is an abundant number, since it is smaller than the sum of its proper divisors (83056428).

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

28484820 is a wasteful number, since it uses less digits than its factorization.

28484820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119 (or 114 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 36.

The square root of 28484820 is about 5337.1171993877. The cubic root of 28484820 is about 305.4014957926.

The spelling of 28484820 in words is "twenty-eight million, four hundred eighty-four thousand, eight hundred twenty".