4491432640 has 112 divisors (see below), whose sum is σ = 11817047232. Its totient is φ = 1617330176.

The previous prime is 4491432619. The next prime is 4491432653. The reversal of 4491432640 is 462341944.

It is a self number, because there is not a number n which added to its sum of digits gives 4491432640.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107172 + ... + 143068.

Almost surely, 2^4491432640 is an apocalyptic number.

4491432640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4491432640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5908523616).

4491432640 is an abundant number, since it is smaller than the sum of its proper divisors (7325614592).

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

4491432640 is a wasteful number, since it uses less digits than its factorization.

4491432640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35954 (or 35944 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 37.

The square root of 4491432640 is about 67018.1515710483. The cubic root of 4491432640 is about 1649.9152255190.

The spelling of 4491432640 in words is "four billion, four hundred ninety-one million, four hundred thirty-two thousand, six hundred forty".