7643428 has 12 divisors (see below), whose sum is σ = 14405020. Its totient is φ = 3527712.

The previous prime is 7643417. The next prime is 7643431. The reversal of 7643428 is 8243467.

It can be written as a sum of positive squares in 2 ways, for example, as 1532644 + 6110784 = 1238^2 + 2472^2 .

It is a d-powerful number, because it can be written as 7⁸ + 6⁷ + 4⁴ + 3¹³ + 4⁶ + 2³ + 8 .

It is a junction number, because it is equal to n+sod(n) for n = 7643393 and 7643402.

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, 73443 + ... + 73546.

Almost surely, 2^7643428 is an apocalyptic number.

It is an amenable number.

7643428 is a deficient number, since it is larger than the sum of its proper divisors (6761592).

7643428 is a wasteful number, since it uses less digits than its factorization.

It is an anagram of its base 12 representation: 7643428 = (2687344)₁₂.

7643428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147006 (or 147004 counting only the distinct ones).

The product of its digits is 32256, while the sum is 34.

The square root of 7643428 is about 2764.6750261107. The cubic root of 7643428 is about 196.9832928362.

The spelling of 7643428 in words is "seven million, six hundred forty-three thousand, four hundred twenty-eight".