9720428 has 12 divisors (see below), whose sum is σ = 17063592. Its totient is φ = 4845120.

The previous prime is 9720407. The next prime is 9720433. The reversal of 9720428 is 8240279.

It is a junction number, because it is equal to n+sod(n) for n = 9720394 and 9720403.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2258 + ... + 4953.

It is an arithmetic number, because the mean of its divisors is an integer number (1421966).

Almost surely, 2^9720428 is an apocalyptic number.

It is an amenable number.

9720428 is a deficient number, since it is larger than the sum of its proper divisors (7343164).

9720428 is a wasteful number, since it uses less digits than its factorization.

9720428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7552 (or 7550 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 9720428 is about 3117.7600934004. The cubic root of 9720428 is about 213.4167306315.

The spelling of 9720428 in words is "nine million, seven hundred twenty thousand, four hundred twenty-eight".