491729646044 has 144 divisors (see below), whose sum is σ = 1121092503552. Its totient is φ = 184421293056.

The previous prime is 491729646029. The next prime is 491729646137. The reversal of 491729646044 is 440646927194.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12278477 + ... + 12318459.

It is an arithmetic number, because the mean of its divisors is an integer number (7785364608).

Almost surely, 2^491729646044 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 491729646044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (560546251776).

491729646044 is an abundant number, since it is smaller than the sum of its proper divisors (629362857508).

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

491729646044 is a wasteful number, since it uses less digits than its factorization.

491729646044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40156 (or 40141 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 56.

The spelling of 491729646044 in words is "four hundred ninety-one billion, seven hundred twenty-nine million, six hundred forty-six thousand, forty-four".