3928643633 has 4 divisors (see below), whose sum is σ = 3942826740. Its totient is φ = 3914460528.

The previous prime is 3928643627. The next prime is 3928643651. The reversal of 3928643633 is 3363468293.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3363468293 = 19 ⋅177024647.

It can be written as a sum of positive squares in 2 ways, for example, as 235407649 + 3693235984 = 15343^2 + 60772^2 .

It is a cyclic number.

It is not a de Polignac number, because 3928643633 - 2⁶ = 3928643569 is a prime.

It is a super-3 number, since 3×3928643633³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3928603633) 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, 7091138 + ... + 7091691.

It is an arithmetic number, because the mean of its divisors is an integer number (985706685).

Almost surely, 2^3928643633 is an apocalyptic number.

It is an amenable number.

3928643633 is a deficient number, since it is larger than the sum of its proper divisors (14183107).

3928643633 is a wasteful number, since it uses less digits than its factorization.

3928643633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14183106.

The product of its digits is 1679616, while the sum is 47.

The square root of 3928643633 is about 62678.8930422355. The cubic root of 3928643633 is about 1577.9050953518.

The spelling of 3928643633 in words is "three billion, nine hundred twenty-eight million, six hundred forty-three thousand, six hundred thirty-three".