3991628892 has 24 divisors (see below), whose sum is σ = 9431699200. Its totient is φ = 1313700336.

The previous prime is 3991628843. The next prime is 3991628911. The reversal of 3991628892 is 2988261993.

It is a super-2 number, since 2×3991628892² = 31866202422898295328, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2104342 + ... + 2106237.

Almost surely, 2^3991628892 is an apocalyptic number.

It is an amenable number.

3991628892 is an abundant number, since it is smaller than the sum of its proper divisors (5440070308).

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

3991628892 is a wasteful number, since it uses less digits than its factorization.

3991628892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4210665 (or 4210663 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 57.

The square root of 3991628892 is about 63179.3391228493. The cubic root of 3991628892 is about 1586.2929197800.

The spelling of 3991628892 in words is "three billion, nine hundred ninety-one million, six hundred twenty-eight thousand, eight hundred ninety-two".