22731128 has 32 divisors (see below), whose sum is σ = 50392800. Its totient is φ = 9405312.

The previous prime is 22731089. The next prime is 22731131. The reversal of 22731128 is 82113722.

It is a junction number, because it is equal to n+sod(n) for n = 22731097 and 22731106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5375 + ... + 8622.

It is an arithmetic number, because the mean of its divisors is an integer number (1574775).

Almost surely, 2^22731128 is an apocalyptic number.

22731128 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

22731128 is an abundant number, since it is smaller than the sum of its proper divisors (27661672).

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

22731128 is a wasteful number, since it uses less digits than its factorization.

22731128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14039 (or 14035 counting only the distinct ones).

The product of its digits is 1344, while the sum is 26.

The square root of 22731128 is about 4767.7172734968. The cubic root of 22731128 is about 283.2741831156.

The spelling of 22731128 in words is "twenty-two million, seven hundred thirty-one thousand, one hundred twenty-eight".