4491296640 has 256 divisors, whose sum is σ = 16843464000. Its totient is φ = 1127153664.

The previous prime is 4491296639. The next prime is 4491296653. The reversal of 4491296640 is 466921944.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 286116 + ... + 301404.

Almost surely, 2^4491296640 is an apocalyptic number.

4491296640 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 4491296640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8421732000).

4491296640 is an abundant number, since it is smaller than the sum of its proper divisors (12352167360).

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

4491296640 is a wasteful number, since it uses less digits than its factorization.

4491296640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15334 (or 15316 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The square root of 4491296640 is about 67017.1369128822. The cubic root of 4491296640 is about 1649.8985722776.

The spelling of 4491296640 in words is "four billion, four hundred ninety-one million, two hundred ninety-six thousand, six hundred forty".