499999644 has 18 divisors (see below), whose sum is σ = 1263888080. Its totient is φ = 166666536.

The previous prime is 499999613. The next prime is 499999693. The reversal of 499999644 is 446999994.

It is a tau number, because it is divible by the number of its divisors (18).

It is a nude number because it is divisible by every one of its digits.

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 5 ways as a sum of consecutive naturals, for example, 6944404 + ... + 6944475.

Almost surely, 2^499999644 is an apocalyptic number.

It is an amenable number.

499999644 is an abundant number, since it is smaller than the sum of its proper divisors (763888436).

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

499999644 is a wasteful number, since it uses less digits than its factorization.

499999644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13888889 (or 13888884 counting only the distinct ones).

The product of its digits is 22674816, while the sum is 63.

The square root of 499999644 is about 22360.6718145945. The cubic root of 499999644 is about 793.7003376125.

The spelling of 499999644 in words is "four hundred ninety-nine million, nine hundred ninety-nine thousand, six hundred forty-four".