3891663432 has 48 divisors (see below), whose sum is σ = 10543020540. Its totient is φ = 1296839808.

The previous prime is 3891663343. The next prime is 3891663437. The reversal of 3891663432 is 2343661983.

3891663432 is a `hidden beast` number, since 3 + 8 + 9 + 1 + 6 + 634 + 3 + 2 = 666.

3891663432 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 3887023716 + 4639716 = 62346^2 + 2154^2 .

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (3891663437) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 349698 + ... + 360654.

Almost surely, 2^3891663432 is an apocalyptic number.

It is an amenable number.

3891663432 is an abundant number, since it is smaller than the sum of its proper divisors (6651357108).

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

3891663432 is a wasteful number, since it uses less digits than its factorization.

3891663432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15902 (or 15895 counting only the distinct ones).

The product of its digits is 559872, while the sum is 45.

The square root of 3891663432 is about 62383.1983149309. The cubic root of 3891663432 is about 1572.9385553530.

The spelling of 3891663432 in words is "three billion, eight hundred ninety-one million, six hundred sixty-three thousand, four hundred thirty-two".