23220728 has 8 divisors (see below), whose sum is σ = 43538880. Its totient is φ = 11610360.

The previous prime is 23220683. The next prime is 23220737. The reversal of 23220728 is 82702232.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 23220697 and 23220706.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1451288 + ... + 1451303.

It is an arithmetic number, because the mean of its divisors is an integer number (5442360).

Almost surely, 2^23220728 is an apocalyptic number.

It is an amenable number.

23220728 is a deficient number, since it is larger than the sum of its proper divisors (20318152).

23220728 is a wasteful number, since it uses less digits than its factorization.

23220728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2902597 (or 2902593 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 23220728 is about 4818.7890595045. The cubic root of 23220728 is about 285.2935438640.

The spelling of 23220728 in words is "twenty-three million, two hundred twenty thousand, seven hundred twenty-eight".