1720553140 has 12 divisors (see below), whose sum is σ = 3613161636. Its totient is φ = 688221248.

The previous prime is 1720553137. The next prime is 1720553143. The reversal of 1720553140 is 413550271.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1720553137) and next prime (1720553143).

It can be written as a sum of positive squares in 2 ways, for example, as 686544804 + 1034008336 = 26202^2 + 32156^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1720553099 and 1720553108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720553143) 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, 43013809 + ... + 43013848.

It is an arithmetic number, because the mean of its divisors is an integer number (301096803).

Almost surely, 2^1720553140 is an apocalyptic number.

1720553140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1720553140 is an abundant number, since it is smaller than the sum of its proper divisors (1892608496).

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

1720553140 is a wasteful number, since it uses less digits than its factorization.

1720553140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86027666 (or 86027664 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 1720553140 is about 41479.5508654566. The cubic root of 1720553140 is about 1198.2737076011.

The spelling of 1720553140 in words is "one billion, seven hundred twenty million, five hundred fifty-three thousand, one hundred forty".