3991532670 has 96 divisors (see below), whose sum is σ = 10658718720. Its totient is φ = 1036002240.

The previous prime is 3991532603. The next prime is 3991532683. The reversal of 3991532670 is 762351993.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 500857 + ... + 508763.

It is an arithmetic number, because the mean of its divisors is an integer number (111028320).

Almost surely, 2^3991532670 is an apocalyptic number.

3991532670 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 3991532670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5329359360).

3991532670 is an abundant number, since it is smaller than the sum of its proper divisors (6667186050).

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

3991532670 is a wasteful number, since it uses less digits than its factorization.

3991532670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8070 (or 8067 counting only the distinct ones).

The product of its (nonzero) digits is 306180, while the sum is 45.

The square root of 3991532670 is about 63178.5776193165. The cubic root of 3991532670 is about 1586.2801733125.

The spelling of 3991532670 in words is "three billion, nine hundred ninety-one million, five hundred thirty-two thousand, six hundred seventy".