28422030 has 128 divisors (see below), whose sum is σ = 87091200. Its totient is φ = 5773824.

The previous prime is 28422013. The next prime is 28422049. The reversal of 28422030 is 3022482.

28422030 is a nontrivial binomial coefficient, being equal to C(7540, 2).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28421988 and 28422006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 78991 + ... + 79349.

It is an arithmetic number, because the mean of its divisors is an integer number (680400).

Almost surely, 2^28422030 is an apocalyptic number.

28422030 is the 7539-th triangular number and also the 3770-th hexagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28422030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43545600).

28422030 is an abundant number, since it is smaller than the sum of its proper divisors (58669170).

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

28422030 is a wasteful number, since it uses less digits than its factorization.

28422030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 28422030 is about 5331.2315650326. The cubic root of 28422030 is about 305.1769286090.

The spelling of 28422030 in words is "twenty-eight million, four hundred twenty-two thousand, thirty".