499721664 has 112 divisors (see below), whose sum is σ = 1507772448. Its totient is φ = 144703488.

The previous prime is 499721609. The next prime is 499721671. The reversal of 499721664 is 466127994.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36544 + ... + 48320.

It is an arithmetic number, because the mean of its divisors is an integer number (13462254).

Almost surely, 2^499721664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 499721664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (753886224).

499721664 is an abundant number, since it is smaller than the sum of its proper divisors (1008050784).

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

499721664 is a wasteful number, since it uses less digits than its factorization.

499721664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11822 (or 11812 counting only the distinct ones).

The product of its digits is 653184, while the sum is 48.

The square root of 499721664 is about 22354.4551264396. The cubic root of 499721664 is about 793.5532216943.

The spelling of 499721664 in words is "four hundred ninety-nine million, seven hundred twenty-one thousand, six hundred sixty-four".