9900428 has 12 divisors (see below), whose sum is σ = 17430672. Its totient is φ = 4920240.

The previous prime is 9900427. The next prime is 9900437. The reversal of 9900428 is 8240099.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 9900394 and 9900403.

It is not an unprimeable number, because it can be changed into a prime (9900421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6743 + ... + 8078.

It is an arithmetic number, because the mean of its divisors is an integer number (1452556).

Almost surely, 2^9900428 is an apocalyptic number.

It is an amenable number.

9900428 is a deficient number, since it is larger than the sum of its proper divisors (7530244).

9900428 is a wasteful number, since it uses less digits than its factorization.

9900428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14992 (or 14990 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 9900428 is about 3146.4945574401. The cubic root of 9900428 is about 214.7260111808.

The spelling of 9900428 in words is "nine million, nine hundred thousand, four hundred twenty-eight".