22303428 has 72 divisors (see below), whose sum is σ = 61401312. Its totient is φ = 6281856.

The previous prime is 22303409. The next prime is 22303433. The reversal of 22303428 is 82430322.

It is a junction number, because it is equal to n+sod(n) for n = 22303398 and 22303407.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48576 + ... + 49032.

It is an arithmetic number, because the mean of its divisors is an integer number (852796).

Almost surely, 2^22303428 is an apocalyptic number.

22303428 is a gapful number since it is divisible by the number (28) 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 22303428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30700656).

22303428 is an abundant number, since it is smaller than the sum of its proper divisors (39097884).

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

22303428 is a wasteful number, since it uses less digits than its factorization.

22303428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561 (or 552 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 22303428 is about 4722.6505269816. The cubic root of 22303428 is about 281.4862634964.

The spelling of 22303428 in words is "twenty-two million, three hundred three thousand, four hundred twenty-eight".