491953644 has 72 divisors (see below), whose sum is σ = 1530532640. Its totient is φ = 129745152.

The previous prime is 491953613. The next prime is 491953661. The reversal of 491953644 is 446359194.

491953644 is a `hidden beast` number, since 491 + 95 + 36 + 44 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 491953644.

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 23 ways as a sum of consecutive naturals, for example, 71809 + ... + 78360.

Almost surely, 2^491953644 is an apocalyptic number.

It is an amenable number.

491953644 is an abundant number, since it is smaller than the sum of its proper divisors (1038578996).

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

491953644 is a wasteful number, since it uses less digits than its factorization.

491953644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150199 (or 150194 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 491953644 is about 22180.0280432645. The cubic root of 491953644 is about 789.4198828206.

The spelling of 491953644 in words is "four hundred ninety-one million, nine hundred fifty-three thousand, six hundred forty-four".