1729991616 has 56 divisors (see below), whose sum is σ = 4583612880. Its totient is φ = 575864832.

The previous prime is 1729991581. The next prime is 1729991617. The reversal of 1729991616 is 6161999271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1729991617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141790 + ... + 153506.

It is an arithmetic number, because the mean of its divisors is an integer number (81850230).

Almost surely, 2^1729991616 is an apocalyptic number.

1729991616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1729991616 is an abundant number, since it is smaller than the sum of its proper divisors (2853621264).

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

1729991616 is a wasteful number, since it uses less digits than its factorization.

1729991616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12501 (or 12491 counting only the distinct ones).

The product of its digits is 367416, while the sum is 51.

The square root of 1729991616 is about 41593.1679005098. The cubic root of 1729991616 is about 1200.4608452176.

It can be divided in two parts, 1729 and 991616, that added together give a triangular number (993345 = T₁₄₀₉).

The spelling of 1729991616 in words is "one billion, seven hundred twenty-nine million, nine hundred ninety-one thousand, six hundred sixteen".