491491728924 has 96 divisors (see below), whose sum is σ = 1387896685056. Its totient is φ = 132151050240.

The previous prime is 491491728913. The next prime is 491491728943. The reversal of 491491728924 is 429827194194.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20095447 + ... + 20119889.

It is an arithmetic number, because the mean of its divisors is an integer number (14457257136).

Almost surely, 2^491491728924 is an apocalyptic number.

It is an amenable number.

491491728924 is an abundant number, since it is smaller than the sum of its proper divisors (896404956132).

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

491491728924 is a wasteful number, since it uses less digits than its factorization.

491491728924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38555 (or 38553 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 60.

The spelling of 491491728924 in words is "four hundred ninety-one billion, four hundred ninety-one million, seven hundred twenty-eight thousand, nine hundred twenty-four".