7663428 has 18 divisors (see below), whose sum is σ = 19371534. Its totient is φ = 2554464.

The previous prime is 7663427. The next prime is 7663459. The reversal of 7663428 is 8243667.

It can be written as a sum of positive squares in only one way, i.e., 6874884 + 788544 = 2622^2 + 888^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×7663428² = 117456257422368, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 212873 = 7663428 / (7 + 6 + 6 + 3 + 4 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 7663392 and 7663401.

It is not an unprimeable number, because it can be changed into a prime (7663421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 106401 + ... + 106472.

Almost surely, 2^7663428 is an apocalyptic number.

It is an amenable number.

7663428 is an abundant number, since it is smaller than the sum of its proper divisors (11708106).

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

7663428 is a wasteful number, since it uses less digits than its factorization.

7663428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212883 (or 212878 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 7663428 is about 2768.2897247217. The cubic root of 7663428 is about 197.1549537991.

It can be divided in two parts, 76 and 63428, that added together give a square (63504 = 252²).

The spelling of 7663428 in words is "seven million, six hundred sixty-three thousand, four hundred twenty-eight".