1720607540 has 12 divisors (see below), whose sum is σ = 3613275876. Its totient is φ = 688243008.

The previous prime is 1720607521. The next prime is 1720607561. The reversal of 1720607540 is 457060271.

It can be written as a sum of positive squares in 2 ways, for example, as 1114758544 + 605848996 = 33388^2 + 24614^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1720607497 and 1720607506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43015169 + ... + 43015208.

It is an arithmetic number, because the mean of its divisors is an integer number (301106323).

Almost surely, 2^1720607540 is an apocalyptic number.

1720607540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1720607540 is an abundant number, since it is smaller than the sum of its proper divisors (1892668336).

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

1720607540 is a wasteful number, since it uses less digits than its factorization.

1720607540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86030386 (or 86030384 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 1720607540 is about 41480.2066050785. The cubic root of 1720607540 is about 1198.2863363698.

The spelling of 1720607540 in words is "one billion, seven hundred twenty million, six hundred seven thousand, five hundred forty".