1720457140 has 12 divisors (see below), whose sum is σ = 3612960036. Its totient is φ = 688182848.

The previous prime is 1720457111. The next prime is 1720457149. The reversal of 1720457140 is 417540271.

It can be written as a sum of positive squares in 2 ways, for example, as 961124004 + 759333136 = 31002^2 + 27556^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720457149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43011409 + ... + 43011448.

It is an arithmetic number, because the mean of its divisors is an integer number (301080003).

Almost surely, 2^1720457140 is an apocalyptic number.

1720457140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1720457140 is an abundant number, since it is smaller than the sum of its proper divisors (1892502896).

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

1720457140 is a wasteful number, since it uses less digits than its factorization.

1720457140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86022866 (or 86022864 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 1720457140 is about 41478.3936525994. The cubic root of 1720457140 is about 1198.2514208894.

The spelling of 1720457140 in words is "one billion, seven hundred twenty million, four hundred fifty-seven thousand, one hundred forty".